Synchronisation SAM-ECU Smart Forfour

[Kalectro]

Hello
Please, can you help me to find synchronisation code for a Smart Forfour?
The Vin is :WME4540311B012348
I have these DTC codes:
B1721 - Base Station Fail
B1761 - Vin is not written in the control unit N10/10

Thank you in advance.

[Kalectro]

Problem solved. It was the ring clock.