I read isn cobe from obd in the F20 key program.
　After that, the engine cranks with the original key, but does not start.
Fault code 1b2002.
It seems to have lost sync with the Dme.
Please let me know how to solve this problem.

..try program dme_ buh my question is had the dme refused to read ISN on bench factory mode🤔 also check this bmw service bulletin SI B12 20 16

Thanks, after the failure dme fem body gw did some programming but no improvement.

Please make sure fem body programmed and updated. also check faults on car

Thank you I will check

how u solved it?

i experienced same issue i done the mistake to read isn buy obd car wont start any more .. i feel be lucky because i have mini acdp bmw i read the isn with obd second time and write it and car start if this didn't succed i will be obliged to extract isn from fem with the working key and write it back to dme but the problem that not all dme accept modifiying isn in this case i have to write dme data to fem and this is another headacke story..

If you unlock fem with Autohex you can write dme isn to fem from isn manager option 4 OBD itself. Most of the cases this will solve the issue.