Problem:
During a BMW CAS3+ downgrade, the Yanhua Mini ACDP2 device froze and the operation failed. Now the CAS3+ (ISTAP) module shows no VIN or config options, and all keys are not working. I’ve heard of a ‘downgrade failure’ recovery option for CAS3, but it’s not showing up in the tool menu. Can Yanhua ACDP device repair this CAS module?
Solution:
Yes, Yanhua ACDP will repair BMW CAS3+ ISTAP module if downgrade failed and is corrupted.
Menu path:
IMMO Programming- BMW- CAS1 to 4- CAS3/CAS3+.
Select OBD Mode– IMMO Function.
Go to Special Function.
Choose ISTAP original repair.
NOTE: The repair is done via OBD mode rather than ICP mode. Connect the ACDP with the vehicle OBD port and make sure the vehicle has enough battery supply. DO NOT cut off power nor unplug the devce during the operation.
*ISTAP original repair and ISTAP downgrade repair are the same. Select original software version and repair the bricked module.
For CAS3+ istap, better do it via ICP mode using ACDP solder free adapter. You will always be encouraged to pull cas and do it on bench.
Read also:
How to Repair BMW CAS3++ ISTAP Corrupt Module with Autel KM100?
Repair BMW CAS3+ ISTAP with Autel IM508/IM608 After Failed Update via OBD
