Managed to replace/ change Porsche 2M25J CPU on BCM, with back-up of original D-FLSH and P-FLSH
I first tried it myself.
Rewrite partition for 2M25J
If the D-FLSH is 16Kï¼set EEE partition as 8
Partition division complete. Then write the backup D-FLSH, and then P-FLSH
Finish encryption in the end. Porsche encryption byte: 7D
However, the BCM cannot work at all. Failed to read data and unencrypt.
Discussed with the engineer, i adopted the method below:
Step 1 - completely clear the encryption
Select the device and clear the encryption fully
Then CPU is all cleared. Again divide CPU partition. set the partition as 8
Step 2 - Write D-FLSH
Some data to modify before writing D-FLSH
Find out Line â7FF00â and replace â7Dâ with âFFâ, then write CPU
Then perform encryption
When all above is complete, unencryption and encrytion-reading work ok.
So, a good device needs a good way to perform it for the best benefit.
Hope this helps.
Product:
This is from obd2france.com website technical support: VVDI PRO VVDIPROG v4.3.1 replace Porsche BCM 2M25J CPU
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October 2019
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