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How to correct checksum after editing GM's calibration files

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  • GM Car Hacking Expert
  • Contributor

Its BB AB, but if the unedited file ful checksum, is 0x80000 the edited file must be 0x80000.  if you correct checksum and the original file have 0x80000 and the edited file have 0x90000, if i remmember, it fails in programming

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  • Eric Ellison
    Eric Ellison

    Nice info Mr Troy, but if I may offer some advice the windows Calculator has a Programmer mode that easily takes the last four of Big-Endian HEX checksum(highlight all bytes except the first two of .b

  • The way I find the easiest is to set the first two bytes in the file to FF FF, calculate the big-endian 16-bit, take the last 4, i.e. 2F B5, use the Hex Calculator to do FFFF - 2FB5, giving us a resul

  • Mindaugas Cernius
    Mindaugas Cernius

    The checksum calculation can be different for everyone. For example, in BCM Opel using 16-bit Big-Endian, you need to add 8000 to the resulting result to get the correct checksum. We get Buick's check

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  • Contributor

Ok thx but if the edit file has correct checksum but shows now as 0x91000  is it possible to fix that ?

  • GM Car Hacking Expert
  • Contributor
17 minutes ago, Dan79 said:

Ok thx but if the edit file has correct checksum but shows now as 0x91000  is it possible to fix that ?

something is wrong. the checksum in HMI must end in 0000. share this file

  • Contributor

here it is  after edit it i got 15 0E as checksum 

23648990.bin

  • GM Car Hacking Expert
  • Contributor

I get 15FE?   (0xA0000)

  • GM Car Hacking Expert
  • Contributor
8 minutes ago, Dan79 said:

here it is  after edit it i got 15 0E as checksum 

23648990.bin 968 B · 1 download

this file shared is more lenght than this

 

23648990.bin

  • Contributor

Ok i upload original one and that is 0x80000    and i upload the edit one that i get checksum of 0E15 and 0x91000

23223112.bin 2323112.bin edit.bin

  • GM Car Hacking Expert
  • Contributor

2323112.bin edit_2.bin

 

   0x90000  

 

Try it

 

  • Contributor
5 minutes ago, Arbe_gtc said:

Can't download it ,are not +contributor.

What did you change ?can you show me?

Was 0E15 correct?

  • GM Car Hacking Expert
  • Contributor
1 minute ago, Dan79 said:

Can't download it ,are not +contributor.

What did you change ?can you show me?

Was 0E15 correct?

image.png.54f5cd99d4fa8c856969d82bd7332b07.png

  • Contributor
1 minute ago, Arbe_gtc said:

image.png.54f5cd99d4fa8c856969d82bd7332b07.png

Thx I will test that and let you know the results 

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