Appareils Mixtes Chauds - diyobd2.fr

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 16K，set EEE partition as 8

Xhorse VVDI PROG Programmer:

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 “7FF00” and replace “7D” with “FF”, 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:

VVDI PROG Programmer Prog V4.4.9:

This is from obd2france.com website technical support: VVDI PRO VVDIPROG v4.3.1 replace Porsche BCM 2M25J CPU