When you BMW CAS+ downgrade failed, no more sweating and pain. VVDI BMW Tool released a “Fixed CAS EEPROM” function.
Use VVDI BMW function to Fix eeprom boot mode of CAS BMW.
Q: Is this function all through obd2?
A: Need to load eeprom and then write back to the unit.
Q: No hooking up to the eprom?
A: need, you fix the problem anyways
Q:Does this function will come also for cas4+ in the future?
A: CAS4 will be added in the feature.
http://www.vvdishop.com/service/vvdi-bmw-fixed-bmw-cas-downgrade-failure.html