0285001448 MB W639 does not communicate

[lidons]

the original SRS W639 control unit got wet and there is no communication ,,,
to get a second hand, i tried to pair with autel, and didn't know how to do it.
I disassembled it to read the original MCU 912D60 (0L26M) and second hand 912D60 (1L26M), with EEP + Rom ORANGE5 incircuit 912D60 (VCC+GND+Reset+BKGD) (the ROMs are identical to the two ECUs). Burn the original file on the second hand. and I no longer had communication with the control unit by OBD ..




I want to try to read on the workbench and these are the pinouts that I have deduced to be
pinout
1 + 2 12v
3 CAN-L
4 CAN-H
83 + 84 GND




I need to know what happened and try to communicate at the work table with her ...




any advice am i stuck?

I think that to read the ROM, it may be that it has been damaged, checksum, but this MCU does not allow to write new ROM, it is a single write ... I also upload ROM ...
Also the possibility of some damaged SMD component ...