Got IMMO data from Kessy module by VVDI Key Tool Plus, load the file into VVDI2 to get 7 bytes CS, and it prompts “CRC verify error”.
Reduce Kessy immo data file size from 2.25KB to 2.00KB.
How to reduce Kessy immo data file size?
As the instruction, data from 0*800 is secured and every time Key Tool Plus will get a different result.
So we save data from 0*800 and delete data below 800 (801*900).
Then read 7 bytes CS code without problem, and we can make a dealer key.
Also, we need to save an original key to avoid corrupting data.
Problem & Solution from Richard Ruiz.