diff --git a/latest/Firmware/Bootloader/.cproject b/latest/Firmware/Bootloader/.cproject
index 3c8532e..5526861 100644
--- a/latest/Firmware/Bootloader/.cproject
+++ b/latest/Firmware/Bootloader/.cproject
@@ -2,7 +2,7 @@
 <?fileVersion 4.0.0?><cproject storage_type_id="org.eclipse.cdt.core.XmlProjectDescriptionStorage">
 	<storageModule moduleId="org.eclipse.cdt.core.settings">
 		<cconfiguration id="fr.ac6.managedbuild.config.gnu.cross.exe.debug.1574687779.879054770.1155131264">
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+			<storageModule buildSystemId="org.eclipse.cdt.managedbuilder.core.configurationDataProvider" id="fr.ac6.managedbuild.config.gnu.cross.exe.debug.1574687779.879054770.1155131264" moduleId="org.eclipse.cdt.core.settings" name="L422">
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 				<extensions>
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@@ -14,7 +14,7 @@
 				</extensions>
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-				<configuration artifactExtension="elf" artifactName="${ProjName}" buildArtefactType="org.eclipse.cdt.build.core.buildArtefactType.exe" buildProperties="org.eclipse.cdt.build.core.buildArtefactType=org.eclipse.cdt.build.core.buildArtefactType.exe,org.eclipse.cdt.build.core.buildType=org.eclipse.cdt.build.core.buildType.debug" cleanCommand="rm -rf" description="" id="fr.ac6.managedbuild.config.gnu.cross.exe.debug.1574687779.879054770.1155131264" name="L422-Debug" optionalBuildProperties="org.eclipse.cdt.docker.launcher.containerbuild.property.selectedvolumes=,org.eclipse.cdt.docker.launcher.containerbuild.property.volumes=" parent="fr.ac6.managedbuild.config.gnu.cross.exe.debug.1574687779.879054770.1155131264" postannouncebuildStep="Generating binary and Printing size information:" postbuildStep="arm-none-eabi-objcopy -O binary &quot;${BuildArtifactFileBaseName}.elf&quot; &quot;${BuildArtifactFileBaseName}.bin&quot; &amp;&amp; arm-none-eabi-size &quot;${BuildArtifactFileName}&quot;">
+				<configuration artifactExtension="elf" artifactName="${ProjName}" buildArtefactType="org.eclipse.cdt.build.core.buildArtefactType.exe" buildProperties="org.eclipse.cdt.build.core.buildArtefactType=org.eclipse.cdt.build.core.buildArtefactType.exe,org.eclipse.cdt.build.core.buildType=org.eclipse.cdt.build.core.buildType.debug" cleanCommand="rm -rf" description="" id="fr.ac6.managedbuild.config.gnu.cross.exe.debug.1574687779.879054770.1155131264" name="L422" optionalBuildProperties="org.eclipse.cdt.docker.launcher.containerbuild.property.selectedvolumes=,org.eclipse.cdt.docker.launcher.containerbuild.property.volumes=" parent="fr.ac6.managedbuild.config.gnu.cross.exe.debug.1574687779.879054770.1155131264" postannouncebuildStep="Generating binary and Printing size information:" postbuildStep="arm-none-eabi-objcopy -O binary &quot;${BuildArtifactFileBaseName}.elf&quot; &quot;${BuildArtifactFileBaseName}.bin&quot; &amp;&amp; arm-none-eabi-size &quot;${BuildArtifactFileName}&quot;">
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@@ -49,7 +49,7 @@
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+							<option id="ilg.gnuarmeclipse.managedbuild.cross.option.optimization.level.1494490553" name="Optimization Level" superClass="ilg.gnuarmeclipse.managedbuild.cross.option.optimization.level" useByScannerDiscovery="true" value="ilg.gnuarmeclipse.managedbuild.cross.option.optimization.level.size" valueType="enumerated"/>
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+								<option id="ilg.gnuarmeclipse.managedbuild.cross.option.c.linker.strip.1622093485" name="Omit all symbol information (-s)" superClass="ilg.gnuarmeclipse.managedbuild.cross.option.c.linker.strip" useByScannerDiscovery="false" value="true" valueType="boolean"/>
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@@ -153,7 +153,7 @@
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+			<storageModule buildSystemId="org.eclipse.cdt.managedbuilder.core.configurationDataProvider" id="fr.ac6.managedbuild.config.gnu.cross.exe.debug.1574687779.879054770.1155131264.770870440" moduleId="org.eclipse.cdt.core.settings" name="L432">
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@@ -165,7 +165,7 @@
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+				<configuration artifactExtension="elf" artifactName="${ProjName}" buildArtefactType="org.eclipse.cdt.build.core.buildArtefactType.exe" buildProperties="org.eclipse.cdt.build.core.buildArtefactType=org.eclipse.cdt.build.core.buildArtefactType.exe,org.eclipse.cdt.build.core.buildType=org.eclipse.cdt.build.core.buildType.debug" cleanCommand="rm -rf" description="" id="fr.ac6.managedbuild.config.gnu.cross.exe.debug.1574687779.879054770.1155131264.770870440" name="L432" optionalBuildProperties="org.eclipse.cdt.docker.launcher.containerbuild.property.selectedvolumes=,org.eclipse.cdt.docker.launcher.containerbuild.property.volumes=" parent="fr.ac6.managedbuild.config.gnu.cross.exe.debug.1574687779.879054770.1155131264.770870440" postannouncebuildStep="Generating binary and Printing size information:" postbuildStep="arm-none-eabi-objcopy -O binary &quot;${BuildArtifactFileBaseName}.elf&quot; &quot;${BuildArtifactFileBaseName}.bin&quot; &amp;&amp; arm-none-eabi-size &quot;${BuildArtifactFileName}&quot;">
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@@ -200,7 +200,7 @@
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+							<option id="ilg.gnuarmeclipse.managedbuild.cross.option.optimization.level.1845575708" name="Optimization Level" superClass="ilg.gnuarmeclipse.managedbuild.cross.option.optimization.level" useByScannerDiscovery="true" value="ilg.gnuarmeclipse.managedbuild.cross.option.optimization.level.size" valueType="enumerated"/>
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+							<option id="ilg.gnuarmeclipse.managedbuild.cross.option.debugging.level.179700887" name="Debug level" superClass="ilg.gnuarmeclipse.managedbuild.cross.option.debugging.level" useByScannerDiscovery="true" value="ilg.gnuarmeclipse.managedbuild.cross.option.debugging.level.none" valueType="enumerated"/>
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@@ -267,7 +267,7 @@
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+								<option id="ilg.gnuarmeclipse.managedbuild.cross.option.c.linker.strip.223731707" name="Omit all symbol information (-s)" superClass="ilg.gnuarmeclipse.managedbuild.cross.option.c.linker.strip" useByScannerDiscovery="false" value="true" valueType="boolean"/>
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@@ -303,6 +303,308 @@
 			<storageModule moduleId="org.eclipse.cdt.core.externalSettings"/>
 			<storageModule moduleId="ilg.gnumcueclipse.managedbuild.packs"/>
 		</cconfiguration>
+		<cconfiguration id="fr.ac6.managedbuild.config.gnu.cross.exe.debug.1574687779.879054770.1155131264.597226944">
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+				<externalSettings/>
+				<extensions>
+					<extension id="org.eclipse.cdt.core.ELF" point="org.eclipse.cdt.core.BinaryParser"/>
+					<extension id="org.eclipse.cdt.core.GASErrorParser" point="org.eclipse.cdt.core.ErrorParser"/>
+					<extension id="org.eclipse.cdt.core.GmakeErrorParser" point="org.eclipse.cdt.core.ErrorParser"/>
+					<extension id="org.eclipse.cdt.core.GLDErrorParser" point="org.eclipse.cdt.core.ErrorParser"/>
+					<extension id="org.eclipse.cdt.core.CWDLocator" point="org.eclipse.cdt.core.ErrorParser"/>
+					<extension id="org.eclipse.cdt.core.GCCErrorParser" point="org.eclipse.cdt.core.ErrorParser"/>
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+									<listOptionValue builtIn="false" value="&quot;${workspace_loc:/${ProjName}/Drivers/STM32L4xx_HAL_Driver/Inc}&quot;"/>
+									<listOptionValue builtIn="false" value="&quot;${workspace_loc:/${ProjName}/Drivers/CMSIS/Include}&quot;"/>
+									<listOptionValue builtIn="false" value="&quot;${workspace_loc:/${ProjName}/Drivers/CMSIS/Device/ST/STM32L4xx/Include}&quot;"/>
+								</option>
+								<option IS_BUILTIN_EMPTY="false" IS_VALUE_EMPTY="false" id="ilg.gnuarmeclipse.managedbuild.cross.option.c.compiler.defs.1207814495" name="Defined symbols (-D)" superClass="ilg.gnuarmeclipse.managedbuild.cross.option.c.compiler.defs" useByScannerDiscovery="true" valueType="definedSymbols">
+									<listOptionValue builtIn="false" value="STM32L431xx"/>
+								</option>
+								<inputType id="ilg.gnuarmeclipse.managedbuild.cross.tool.c.compiler.input.782076456" superClass="ilg.gnuarmeclipse.managedbuild.cross.tool.c.compiler.input"/>
+							</tool>
+							<tool id="ilg.gnuarmeclipse.managedbuild.cross.tool.cpp.compiler.1050763378" name="GNU ARM Cross C++ Compiler" superClass="ilg.gnuarmeclipse.managedbuild.cross.tool.cpp.compiler"/>
+							<tool id="ilg.gnuarmeclipse.managedbuild.cross.tool.c.linker.1782191445" name="GNU ARM Cross C Linker" superClass="ilg.gnuarmeclipse.managedbuild.cross.tool.c.linker">
+								<option id="ilg.gnuarmeclipse.managedbuild.cross.option.c.linker.gcsections.1778999773" name="Remove unused sections (-Xlinker --gc-sections)" superClass="ilg.gnuarmeclipse.managedbuild.cross.option.c.linker.gcsections" useByScannerDiscovery="false" value="true" valueType="boolean"/>
+								<option IS_BUILTIN_EMPTY="false" IS_VALUE_EMPTY="false" id="ilg.gnuarmeclipse.managedbuild.cross.option.c.linker.scriptfile.1038467567" name="Script files (-T)" superClass="ilg.gnuarmeclipse.managedbuild.cross.option.c.linker.scriptfile" useByScannerDiscovery="false" valueType="stringList">
+									<listOptionValue builtIn="false" value="&quot;${workspace_loc:/${ProjName}/STM32L4xx_FLASH.ld}&quot;"/>
+								</option>
+								<option id="ilg.gnuarmeclipse.managedbuild.cross.option.c.linker.other.91255004" name="Other linker flags" superClass="ilg.gnuarmeclipse.managedbuild.cross.option.c.linker.other" useByScannerDiscovery="false" value="--specs=rdimon.specs" valueType="string"/>
+								<option id="ilg.gnuarmeclipse.managedbuild.cross.option.c.linker.usenewlibnano.1090605765" name="Use newlib-nano (--specs=nano.specs)" superClass="ilg.gnuarmeclipse.managedbuild.cross.option.c.linker.usenewlibnano" useByScannerDiscovery="false" value="true" valueType="boolean"/>
+								<option id="ilg.gnuarmeclipse.managedbuild.cross.option.c.linker.usenewlibnosys.1902637409" name="Do not use syscalls (--specs=nosys.specs)" superClass="ilg.gnuarmeclipse.managedbuild.cross.option.c.linker.usenewlibnosys" useByScannerDiscovery="false" value="true" valueType="boolean"/>
+								<option id="ilg.gnuarmeclipse.managedbuild.cross.option.c.linker.strip.1053970674" name="Omit all symbol information (-s)" superClass="ilg.gnuarmeclipse.managedbuild.cross.option.c.linker.strip" useByScannerDiscovery="false" value="true" valueType="boolean"/>
+								<inputType id="ilg.gnuarmeclipse.managedbuild.cross.tool.c.linker.input.281875949" superClass="ilg.gnuarmeclipse.managedbuild.cross.tool.c.linker.input">
+									<additionalInput kind="additionalinputdependency" paths="$(USER_OBJS)"/>
+									<additionalInput kind="additionalinput" paths="$(LIBS)"/>
+								</inputType>
+							</tool>
+							<tool id="ilg.gnuarmeclipse.managedbuild.cross.tool.cpp.linker.718505590" name="GNU ARM Cross C++ Linker" superClass="ilg.gnuarmeclipse.managedbuild.cross.tool.cpp.linker">
+								<option id="ilg.gnuarmeclipse.managedbuild.cross.option.cpp.linker.gcsections.1910322389" name="Remove unused sections (-Xlinker --gc-sections)" superClass="ilg.gnuarmeclipse.managedbuild.cross.option.cpp.linker.gcsections" value="true" valueType="boolean"/>
+							</tool>
+							<tool id="ilg.gnuarmeclipse.managedbuild.cross.tool.archiver.107762314" name="GNU ARM Cross Archiver" superClass="ilg.gnuarmeclipse.managedbuild.cross.tool.archiver"/>
+							<tool id="ilg.gnuarmeclipse.managedbuild.cross.tool.createflash.1089251239" name="GNU ARM Cross Create Flash Image" superClass="ilg.gnuarmeclipse.managedbuild.cross.tool.createflash">
+								<option id="ilg.gnuarmeclipse.managedbuild.cross.option.createflash.choice.11760991" name="Output file format (-O)" superClass="ilg.gnuarmeclipse.managedbuild.cross.option.createflash.choice" useByScannerDiscovery="false" value="ilg.gnuarmeclipse.managedbuild.cross.option.createflash.choice.binary" valueType="enumerated"/>
+							</tool>
+							<tool id="ilg.gnuarmeclipse.managedbuild.cross.tool.createlisting.275627790" name="GNU ARM Cross Create Listing" superClass="ilg.gnuarmeclipse.managedbuild.cross.tool.createlisting">
+								<option id="ilg.gnuarmeclipse.managedbuild.cross.option.createlisting.source.1027412065" name="Display source (--source|-S)" superClass="ilg.gnuarmeclipse.managedbuild.cross.option.createlisting.source" value="true" valueType="boolean"/>
+								<option id="ilg.gnuarmeclipse.managedbuild.cross.option.createlisting.allheaders.2135863671" name="Display all headers (--all-headers|-x)" superClass="ilg.gnuarmeclipse.managedbuild.cross.option.createlisting.allheaders" value="true" valueType="boolean"/>
+								<option id="ilg.gnuarmeclipse.managedbuild.cross.option.createlisting.demangle.446541079" name="Demangle names (--demangle|-C)" superClass="ilg.gnuarmeclipse.managedbuild.cross.option.createlisting.demangle" value="true" valueType="boolean"/>
+								<option id="ilg.gnuarmeclipse.managedbuild.cross.option.createlisting.linenumbers.268589019" name="Display line numbers (--line-numbers|-l)" superClass="ilg.gnuarmeclipse.managedbuild.cross.option.createlisting.linenumbers" value="true" valueType="boolean"/>
+								<option id="ilg.gnuarmeclipse.managedbuild.cross.option.createlisting.wide.161065475" name="Wide lines (--wide|-w)" superClass="ilg.gnuarmeclipse.managedbuild.cross.option.createlisting.wide" value="true" valueType="boolean"/>
+							</tool>
+							<tool id="ilg.gnuarmeclipse.managedbuild.cross.tool.printsize.514168473" name="GNU ARM Cross Print Size" superClass="ilg.gnuarmeclipse.managedbuild.cross.tool.printsize">
+								<option id="ilg.gnuarmeclipse.managedbuild.cross.option.printsize.format.629763058" name="Size format" superClass="ilg.gnuarmeclipse.managedbuild.cross.option.printsize.format" useByScannerDiscovery="false" value="ilg.gnuarmeclipse.managedbuild.cross.option.printsize.format.sysv" valueType="enumerated"/>
+							</tool>
+						</toolChain>
+					</folderInfo>
+					<sourceEntries>
+						<entry flags="VALUE_WORKSPACE_PATH|RESOLVED" kind="sourcePath" name="startup"/>
+						<entry flags="VALUE_WORKSPACE_PATH|RESOLVED" kind="sourcePath" name="Drivers"/>
+						<entry flags="VALUE_WORKSPACE_PATH|RESOLVED" kind="sourcePath" name="Src"/>
+						<entry flags="VALUE_WORKSPACE_PATH|RESOLVED" kind="sourcePath" name="Inc"/>
+					</sourceEntries>
+				</configuration>
+			</storageModule>
+			<storageModule moduleId="org.eclipse.cdt.core.externalSettings"/>
+			<storageModule moduleId="ilg.gnumcueclipse.managedbuild.packs"/>
+		</cconfiguration>
 	</storageModule>
 	<storageModule moduleId="cdtBuildSystem" version="4.0.0">
 		<project id="ais_bootloader.fr.ac6.managedbuild.target.gnu.cross.exe.789152135" name="Executable"/>
@@ -322,9 +624,12 @@
 			<resource resourceType="PROJECT" workspacePath="/ais_bootloader"/>
 		</configuration>
 		<configuration configurationName="L432-Debug"/>
+		<configuration configurationName="L432"/>
 		<configuration configurationName="L422-Release">
 			<resource resourceType="PROJECT" workspacePath="/ais_bootloader"/>
 		</configuration>
+		<configuration configurationName="L412"/>
+		<configuration configurationName="L422"/>
 		<configuration configurationName="Debug">
 			<resource resourceType="PROJECT" workspacePath="/ais_bootloader"/>
 		</configuration>
diff --git a/latest/Firmware/Bootloader/.gitignore b/latest/Firmware/Bootloader/.gitignore
index 645b7d9..4de101f 100644
--- a/latest/Firmware/Bootloader/.gitignore
+++ b/latest/Firmware/Bootloader/.gitignore
@@ -6,9 +6,8 @@
 *~
 *.d
 
-/Default
-/Release/
-/Debug/
-/L422-Release/
-/L422-Debug/
-/L432-Debug/
+/L412
+/L422
+/L431
+/L432
+
diff --git a/latest/Firmware/Bootloader/STM32L4xx_FLASH.ld b/latest/Firmware/Bootloader/STM32L4xx_FLASH.ld
index 391e32e..98fb015 100644
--- a/latest/Firmware/Bootloader/STM32L4xx_FLASH.ld
+++ b/latest/Firmware/Bootloader/STM32L4xx_FLASH.ld
@@ -61,8 +61,8 @@ _Min_Stack_Size = 0x400; /* required amount of stack */
 /* Specify the memory areas */
 MEMORY
 {
-RAM (xrw)      : ORIGIN = 0x20000000, LENGTH = 39K
-FLASH (rx)      : ORIGIN = 0x8000000, LENGTH = 62K
+RAM (xrw)      : ORIGIN = 0x20000000, LENGTH = 32K
+FLASH (rx)      : ORIGIN = 0x8000000, LENGTH = 16K
 }
 
 /* Define output sections */
diff --git a/latest/Firmware/NMEA2000Adapter/.cproject b/latest/Firmware/NMEA2000Adapter/.cproject
index 7492b81..c7e60ac 100644
--- a/latest/Firmware/NMEA2000Adapter/.cproject
+++ b/latest/Firmware/NMEA2000Adapter/.cproject
@@ -246,8 +246,8 @@
 							<option id="ilg.gnuarmeclipse.managedbuild.cross.option.optimization.lto.1026510985" name="Link-time optimizer (-flto)" superClass="ilg.gnuarmeclipse.managedbuild.cross.option.optimization.lto" useByScannerDiscovery="true" value="true" valueType="boolean"/>
 							<option id="ilg.gnuarmeclipse.managedbuild.cross.option.optimization.nomoveloopinvariants.1805166270" name="Disable loop invariant move (-fno-move-loop-invariants)" superClass="ilg.gnuarmeclipse.managedbuild.cross.option.optimization.nomoveloopinvariants" useByScannerDiscovery="true"/>
 							<option id="ilg.gnuarmeclipse.managedbuild.cross.option.optimization.other.1730692676" name="Other optimization flags" superClass="ilg.gnuarmeclipse.managedbuild.cross.option.optimization.other" useByScannerDiscovery="true"/>
-							<option id="ilg.gnuarmeclipse.managedbuild.cross.option.toolchain.name.50561931" superClass="ilg.gnuarmeclipse.managedbuild.cross.option.toolchain.name" useByScannerDiscovery="false" value="xPack GNU Arm Embedded GCC" valueType="string"/>
-							<option id="ilg.gnuarmeclipse.managedbuild.cross.option.toolchain.id.1170906496" superClass="ilg.gnuarmeclipse.managedbuild.cross.option.toolchain.id" useByScannerDiscovery="false" value="435435382" valueType="string"/>
+							<option id="ilg.gnuarmeclipse.managedbuild.cross.option.toolchain.name.50561931" superClass="ilg.gnuarmeclipse.managedbuild.cross.option.toolchain.name" useByScannerDiscovery="false" value="GNU MCU Eclipse ARM Embedded GCC" valueType="string"/>
+							<option id="ilg.gnuarmeclipse.managedbuild.cross.option.toolchain.id.1170906496" superClass="ilg.gnuarmeclipse.managedbuild.cross.option.toolchain.id" useByScannerDiscovery="false" value="962691777" valueType="string"/>
 							<option id="ilg.gnuarmeclipse.managedbuild.cross.option.warnings.syntaxonly.1496635331" name="Check syntax only (-fsyntax-only)" superClass="ilg.gnuarmeclipse.managedbuild.cross.option.warnings.syntaxonly" useByScannerDiscovery="true"/>
 							<option id="ilg.gnuarmeclipse.managedbuild.cross.option.warnings.pedantic.346635870" name="Pedantic (-pedantic)" superClass="ilg.gnuarmeclipse.managedbuild.cross.option.warnings.pedantic" useByScannerDiscovery="true"/>
 							<option id="ilg.gnuarmeclipse.managedbuild.cross.option.warnings.pedanticerrors.1590053296" name="Pedantic warnings as errors (-pedantic-errors)" superClass="ilg.gnuarmeclipse.managedbuild.cross.option.warnings.pedanticerrors" useByScannerDiscovery="true"/>
diff --git a/latest/Firmware/NMEA2000Adapter/Python/bootloader-py3.py b/latest/Firmware/NMEA2000Adapter/Python/bootloader-py3.py
new file mode 100644
index 0000000..9143843
--- /dev/null
+++ b/latest/Firmware/NMEA2000Adapter/Python/bootloader-py3.py
@@ -0,0 +1,333 @@
+import serial
+import sys
+import time
+import os
+
+ACK  = 0x79
+NACK = 0x1F
+GET  = 0x00
+
+PAGE_SIZE       = 2048
+FLASH_BASE      = 0x08000000
+BAUD_RATE       = 115200
+MAX_IMAGE_SIZE  = 128*1024
+
+# These defaults will be overwritten with results of GET command
+GET_VER_CMD             = 0x01
+GET_ID_CMD              = 0x02
+READ_MEM_CMD            = 0x11
+GO_CMD                  = 0x21
+WRITE_MEM_CMD           = 0x31
+ERASE_CMD               = 0x43          # This may me 0x44 in some chips
+WRITE_PROT_CMD          = 0x63
+WRITE_UNPROT_CMD        = 0x73
+READ_PROT_CMD           = 0x82
+READ_UNPROT_CMD         = 0x92
+
+"""
+def print_packet(d):
+    for c in d:
+        sys.stdout.write("0x{:02x} ".format(c))
+    sys.stdout.write('\n')
+"""
+
+error = "No error"
+
+def configure_commands(data):
+    global GET_VER_CMD
+    global GET_ID_CMD
+    global READ_MEM_CMD
+    global GO_CMD
+    global WRITE_MEM_CMD
+    global ERASE_CMD
+    global WRITE_PROT_CMD
+    global WRITE_UNPROT_CMD
+    global READ_PROT_CMD
+    global READ_UNPROT_CMD
+    
+    GET_VER_CMD         = data[0]
+    GET_ID_CMD          = data[1]
+    READ_MEM_CMD        = data[2]
+    GO_CMD              = data[3]
+    WRITE_MEM_CMD       = data[4]
+    ERASE_CMD           = data[5]
+    WRITE_PROT_CMD      = data[6]
+    WRITE_UNPROT_CMD    = data[7]
+    READ_PROT_CMD       = data[8]
+    READ_UNPROT_CMD     = data[9]
+
+    """
+    s = "Commands: "
+    s += "".join(["0x%x "%d for d in data])
+    print s
+    """
+    
+    
+def packet_checksum(p):
+    x = 0
+    for b in p:
+        x ^= b
+
+    return x
+    
+def read_byte(port):
+    r = port.read(1)
+    if len(r) > 0:
+        return (True, r[0])
+    else:
+        return (False, 0)
+
+def drain(port):
+    keepreading = True
+    while True:
+        (r, keepreading) = read_byte(port)
+        if r == False:
+            break
+    
+def do_handshake(port):
+    port.write([0x7f])
+    (success, b) = read_byte(port)
+    if not success:
+        return False
+
+    return b == ACK
+
+def complement(cmd):
+    c = ~cmd
+    if c < 0:
+        c += 256
+    return c
+
+def send_command(port, cmd):
+    packet = [cmd, complement(cmd)]
+    #print packet
+    port.write(packet)
+    (success, r) = read_byte(port)
+    #print r
+    if not success:
+        #print("Failed to send command 0x{0:2x}".format(cmd))
+        return False
+    
+    if r != ACK:
+        #print("Got NACK for command 0x{0:2x}".format(cmd))
+        return False
+
+    #print "Got ACK"
+    return True
+    
+
+def send_data(port, packet):
+    port.write(packet)    
+    (success, b) = read_byte(port)
+    if not success:
+        #print("No ACK or NACK for data packet")
+        return False
+
+    if b == ACK:
+        return True
+    else:
+        #print("Got NACK for data packet")
+        return False
+
+
+def send_get(port):
+    if not send_command(port, GET):
+        #print("Failed to send command GET")
+        return (False, [])
+
+    (success, bytes) = read_byte(port)
+
+    if success:
+        bytes += 1
+    else:
+        return (False, [])
+
+    data = port.read(bytes)
+    if len(data) < bytes:
+        return (False, [])
+
+    (success, b) = read_byte(port)
+    if not success:
+        return (False, [])
+
+    ba = bytearray()
+    ba.extend(data)
+    
+    return (b == ACK, ba)
+
+
+def hibyte(s):
+    return s >> 8
+
+def lobyte(s):
+    return s & 0xFF
+
+def send_erase_cmd(startpage, numpages):
+    return False
+
+def send_ext_erase_cmd(port, startpage, numpages):
+    if not send_command(port, ERASE_CMD):
+        return False
+        
+    packet = bytearray()
+    packet.append(hibyte(numpages-1))
+    packet.append(lobyte(numpages-1))
+    
+    for p in range(startpage, startpage+numpages):
+        packet.append(hibyte(p))
+        packet.append(lobyte(p))
+        
+    packet.append(packet_checksum(packet))
+
+    #print "Sending packet:"
+    #print_packet(packet)
+    
+    if not send_data(port, packet):
+        return False
+    else:
+        return True
+    
+def write_chunk(port, address, chunk):
+    #print "Writing chunk at 0x{0:08x}".format(address)
+    if not send_command(port, WRITE_MEM_CMD):
+        return False
+
+    #print "Sending address"
+    packet = bytearray()
+    packet.append(address >> 24)
+    packet.append((address >> 16) & 0xff)
+    packet.append((address >> 8) & 0xff)
+    packet.append(address & 0xff)
+    packet.append(packet_checksum(packet))
+    if not send_data(port, packet):
+        return False
+
+    #print "Sending chunk"
+    packet = bytearray()
+    packet.append(len(chunk)-1)
+    packet.extend(chunk)
+    packet.append(packet_checksum(packet))
+    return send_data(port, packet)
+
+def boot(port, address):
+    if not send_command(port, GO_CMD):
+        return False
+
+    packet = bytearray()
+    packet.append(address >> 24)
+    packet.append((address >> 16) & 0xff)
+    packet.append((address >> 8) & 0xff)
+    packet.append(address & 0xff)
+    packet.append(packet_checksum(packet))
+    if not send_data(port, packet):
+        return False
+
+    return True
+    
+
+def programFirmware(portname, filename):
+    address = FLASH_BASE                # Always!
+
+    global error
+    
+    st = os.stat(filename)
+    if st.st_size > MAX_IMAGE_SIZE:
+        error = "Image file too large"
+        return False
+
+    port = serial.Serial(portname, baudrate=BAUD_RATE, timeout=2, parity=serial.PARITY_EVEN, stopbits=1)
+    if port is None or not port.is_open:
+        error = "Failed to open port"
+        return False
+
+    bl_present = False
+    for i in range(5):
+        if do_handshake(port):
+            #print("Bootloader is present")
+            bl_present = True
+            break
+        else:
+            pass
+            #print("No response from bootloader")
+            
+    if not bl_present:
+        port.close()
+        error = "No response from MCU bootloader"
+        return False
+
+    drain(port)
+        
+    (success, data) = send_get(port)
+    if success:
+        configure_commands(data[2:])
+    else:
+        #print("Failed to configure command table")
+        error = "Failed to configure command table"
+        port.close()
+        return False
+        
+    
+    startpage = 0
+    numpages = int(st.st_size / PAGE_SIZE)
+    if st.st_size % PAGE_SIZE > 0:
+        numpages += 1
+
+    if ERASE_CMD == 0x43:
+        r = send_erase_cmd(port, startpage, numpages)
+    else:
+        r = send_ext_erase_cmd(port, startpage, numpages)
+
+
+    if r == False:
+        #print("Failed to erase pages")
+        pass
+    else:
+        #print("Erased {0} flash pages".format(numpages))
+        pass
+
+    
+    addr = address
+    with open(filename, "rb") as f:
+        while True:
+            chunk = f.read(256)
+            if len(chunk) == 0:
+                break
+            
+            rem = len(chunk) % 4
+            for i in range(rem):
+                chunk += 0xff
+
+            if not write_chunk(port, addr, chunk):
+                #print("Write failed")
+                port.close()
+                error = "Write failed"
+                return False
+                
+            addr += len(chunk)
+
+            sys.stdout.write("Flashing: {0:3d}%\r".format(int(100*(addr-address)/st.st_size)))
+            sys.stdout.flush()
+
+    print()
+
+    if not boot(port, address):
+        error = "Failed to send GO command"
+        port.close()
+        return False
+
+    port.close()    
+    return True
+
+if __name__ == '__main__':
+    if len(sys.argv) < 3:
+        print("Usage: {0} port image".format(sys.argv[0]))
+        sys.exit(1)
+
+    if not programFirmware(sys.argv[1], sys.argv[2]):
+        print("Error: {}".format(error))
+
+        
+
+    
+
+