FSC rejected

[role]

my g31 (2018) was updated from S15A-18-03-511 to S15A-25-03-538 (for something related to the suspension).
But now all FSCs (OEM and the later added ones (via USB)) are rejected. (although full screen car play still works) 

I tried to put some of the FSC back via ESYS ( I wasn't sure about the exact proces but it seemed to work).  Yet still they don't bring back the functionality. Seems the fscCert is still not ok somehow. 

In ISTA these show up as Imported (and the other ones as Rejected), I would expect - if they would work- as Accepted. 

How do I proceed to fix this issue?

[ivanivanusic]

my g31 (2018) was updated from S15A-18-03-511 to S15A-25-03-538 (for something related to the suspension).
But now all FSCs (OEM and the later added ones (via USB)) are rejected. (although full screen car play still works) 

I tried to put some of the FSC back via ESYS ( I wasn't sure about the exact proces but it seemed to work).  Yet still they don't bring back the functionality. Seems the fscCert is still not ok somehow. 

In ISTA these show up as Imported (and the other ones as Rejected), I would expect - if they would work- as Accepted. 

How do I proceed to fix this issue?

Buy feature installer code and patch headunit again