The update process is pretty simple if you're using onboard diagnostic/debug connector(red one on the PCB). Main mcu (infineon) has an integrated bootstrap loader to be used in such cases. In theory, I believe the update could also be made through IBUS as in DIS there's a service plan (Flash radio ) for some version of BM54.
I could help you but unfortunately the shipping cost to my location and back is pretty expensive.
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