• SIM800 SeriesEembedded ATCompiling EnvironmentV1.01 9 2013-07-11 3 Download Objective file includes two sections. One is core file for simcom module; another is app file for EAT case. Normally, core is here, just update app file. But if need new core version to build project, should download these two sections together.
• Ansmtmodulerfreferencedesignguidev1.01.pdf 298.34 KiB: MTKUSBDRIVER.rar 8.52 MiB: Sim800 Series ArmFile Download v1.00.rar 10.28 KiB: SIM800 Series Embedded AT Sleep Application NoteV1.01.pdf 348.29 KiB: SIM800 Series Embedded ATApplication Note1.02.pdf 680.09 KiB: SIM800 Series Embedded ATCompiling EnvironmentV1.01.pdf 395.65 KiB: SIM800 SeriesBluetoothApplication NoteV1.
• Sim800 Series ArmFile Download v1.00.rar 10.28 KiB SIM800 Series Embedded AT Sleep Application NoteV1.01.pdf 348.29 KiB SIM800 Series Embedded ATApplication Note1.02.pdf 680.09 KiB.

LS1 Flash Tool (PCMHacking.net) Official release thread.
Please note this code has been updated and migrated to create the open source PCM Hammer flash tool, and it is now able to read and write PCMs with 4 different interface types.

Open Sim900 Customer flash loader.exe. Click 'Browse', and open.cla firmware file. Select COM port and set Speed: 460800. Click 'Start' And power the Arduino main board when show message:'Please power up the target'. And long press sim900-power button until the state LED 'S' lights up. LED 'N' start blink. Simcom SIM800 Series Firmware Download Tool and User Guide V1.23 This archive contains the Simcom SIM800 Series Firmware Download Tool and User Guide Download Uploaded at 2017-08-04 14:08:31 Last updated 2019-08-23 10:59:40 Version V1.23 Requirements.

Check it out here: viewtopic.php?f=42&t=6080
Please discuss this tool here: http://pcmhacking.net/forums/viewtopic.php?f=3&t=3112
Get it here!
This is the initial proof of concept free edition.
Features:

Simcom Flash Update Tool V1 10.1

* Read PCM flash to bin (on bench or in car)
* Change VIN number stored in PCM
Supported PCMS:
* 9354896 (1999 version)
* 12200411 ('0411)
* 12586242 (1Mb LS1)
* LB7 Duramax (512kb)
* 12589463 (GMC 1Mb)
Supported OSIDs:
* All
Requirements:
* AVT 852 Cable
* Microsoft .net runtime v3.5 (available here, if required: http://www.microsoft.com/en-US/download ... aspx?id=21 )
Notes:

Simcom Flash Update Tool V1 10.10

Features will be added over time, and this version will remain free.
This is an entirely original code base, including the PCM 'bootloader'.
There will also be a low cost version of the tool that will support writing, but there is no current ETA on it. It is ready when its ready (its in development now).
I hope to have a number of AVT cables available for purchase in the future. For now if you do not have one, keep an eye on the thread.
There will also be support for other cheaper interface cables added (but NOT ELM interfaces. These are not capable). If you do not currently have an AVT you may wish to hold out for one of these (in development).
If you test this on a car, please post reports of success or failure here: http://pcmhacking.net/forums/viewtopic. ... t=0#p33507

Changelog:
v1.07 2014-06-22 Add definitions for GMC 1Mbit PCMs
v1.05 2013-08-20 Faster read speeds. Added read timer. Test and lock out black box pcms (different hardware and will need to be another project).
v1.04 2013-07-29 More LB7 OSIDs. Test and lock out 1024kb LLY Duramax (different hardware and will need to be another project). Fix LB7 Unlock. Handle non-ascii data in VIN/Serial etc.
v1.03 2013-07-28 Fix user key option. Add extra LB7 OSIDs. Fix handling of PCM delay when requesting seed.

Simcom Flash Update Tool V1 10 Download

v1.02 2013-07-27 Updated UI. Ability to use user supplied key.
v1.01 (not released) 1Mb PCM support
v1.00 2013-07-19 Initial release
Old version archive: