[Maste_rrr]

BMW 750xi (F02) 2009, N63, xDrive.

A transmission swap from 6HP to 8HP70 has been completed.
The transmission wiring connector was modified, an oil line adapter was installed, and the 8HP70 is циLoскёd.

The vehicle drives and shifts normally up to 6th or 7th gear, then there is a harsh shift/impact, followed by “Transmission Malfunction”.
There are fault codes related to engine torque.

It feels like the DME still thinks it is working with a 6HP transmission.
My assumption is that there is incorrect or missing communication between the DME and EGS, especially regarding torque requests and torque monitoring.

What has been done so far:
– The “Zeitkriterium” in the Vehicle Order was changed to 12/2012 (the donor 8HP70 was removed from a 2012 550xi)
– An attempt was made to reprogram / flash the DME and EGS

This did not resolve the issue, and additional faults appeared related to the fuel pump control module, so the situation actually worsened.

Has anyone dealt with a similar 6HP → 8HP70 swap on a pre-LCI F01/F02 xDrive?
I would really appreciate any guidance on what exactly needs to be programmed or changed (VO, flashing strategy, ) to make this setup work correctly.

I would be very grateful for any tips or suggestions.