NefMoto > Technical > Reverse Engineering > VAG DCM3.7 Checksum
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Author Topic: VAG DCM3.7 Checksum  (Read 9695 times)
nano
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« on: December 02, 2016, 08:00:17 AM »
Hello, looking for smart guy to do a collaboration for find CKS on this new ecu. Looking also for good info Smiley
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nano
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« Reply #1 on: December 04, 2016, 11:09:43 PM »
anyone? Sad
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IamwhoIam
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« Reply #2 on: December 06, 2016, 09:04:17 AM »
Have you figured out flashing for them?
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prj
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« Reply #3 on: December 06, 2016, 02:32:22 PM »
There is a Russian tool that flashes them. I have it.

They say it does checksum too, but I have not been able to test.
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IamwhoIam
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« Reply #4 on: December 07, 2016, 01:09:55 AM »
My bad, I thought he was talking about DCM6.x from mk7 Golf 2.0 TDI. DCM3.7 is dead easy to flash, I can do it with my own tools, but I've never looked into checksums for them. They do have RSA though, so I'm not sure what can be done and how.
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prj
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« Reply #5 on: December 07, 2016, 05:54:24 AM »
Quote from: IamwhoIam on December 07, 2016, 01:09:55 AM
DCM3.7 is dead easy to flash, I can do it with my own tools, but I've never looked into checksums for them.
Not aware of any publicly available major tools that do this.

RSA should not be a problem on these if they are SH70xx based.
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IamwhoIam
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« Reply #6 on: December 07, 2016, 09:10:34 AM »
I said "my own tools", where does it say "publicly available tools"? I hardly ever use any of the publicly available tools nowadays, although I have most of them since back in the day.
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turbojohan
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« Reply #7 on: December 07, 2016, 11:20:19 AM »
Quote from: prj on December 06, 2016, 02:32:22 PM
There is a Russian tool that flashes them. I have it.

They say it does checksum too, but I have not been able to test.

I have it too but problems with checksum.
Only durationmap works al other changes the ecu reboots every 30 seconds...
Fgtech works should Ok they say..


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prj
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« Reply #8 on: December 07, 2016, 06:10:10 PM »
Quote from: turbojohan on December 07, 2016, 11:20:19 AM
I have it too but problems with checksum.
Only durationmap works al other changes the ecu reboots every 30 seconds...
Fgtech works should Ok they say..

Are you 100% sure this is not because of your mods?
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turbojohan
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« Reply #9 on: December 08, 2016, 01:24:34 AM »
yes.
Tried all kinds of small mods and all same problem.
I can sent you file if you want to test something.
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prj
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« Reply #10 on: December 08, 2016, 01:55:25 AM »
If you change 1 byte and then get the issue it is for sure a checksum problem.
But if you are able to flash the ECU with a modified file and actually have it boot up (exit bootloader), then I would think the software can be patched to kill checksum checks.
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turbojohan
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« Reply #11 on: December 08, 2016, 03:32:38 AM »
Prj, i've sent you an email.
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