Hmm.. those top digits look like potential part numbers for the TCM: MPC90FLFE043In-Tech wrote:Hello folks,
Yeah here in California it is absolutely crazy. Luckily I have a shit ton of canned foods and lot's of other staples. You guys be safe out there.
Back to the thread...I just read out a T87 8spd file if you guys want to have a look. I didn't see anything very useful but maybe you'll see more. How is the vin number derived? I didn't spot that anywhere in the file and would like to edit it before I post.
Found interesting info online:
The 'unlock' on the T87A, I imagine they are patching in a modified bootloader into the devices which do not require encrypted calibrations... as least this would make sense for it.clarify, while the T87 and T87A are pin-compatible, and use the same CPU, they are not 100% interchangeable. The T87A brought TWO things to us - a secure boot loader (which is why they need be unlocked) and also electrical support for the 9 speed and 10 speed automatic transmissions.
You cannot flash a T87 with T87A software, or vice-versa.
I believe the files get decrypted and saved to flash decrypted, so they are basically patching the bootlaoder so it can read/write raw decrypted files. (I would assume???).. basically what the T87 does compared to the T87A.
Now the question comes... how did they get the base bootloader. I would assume they are using BDM/Jtag to reflash the CPU, or if that has been disabled.. more advanced techniques possible, I can see three possibilities:
1) JTAG/BDM to read entire memory and modify (This can be locked or disabled on boot.. or even permanently disabled so it can never be connected again)
2) They got the signing certificate to generate a valid file to flash (Unlikely.. since they could get customers to use this)
3) Decapping. Paying someone to decap the chip and manually read the base firmware on their R&D unit. Base firmware is then modified and written back to the CPU (If flashing external is not disabled) or placed onto a replacement CPU which is placed onto the board.
4) GM insider has given them the information.