How to Use Autohex II to Downgrade & Restore BMW CAS Version?
The CAS firmware function in the AUTOHEX II
is one of the advanced function to easily downgrade or restore your CAS versions. All complex steps are just made simple and user friendly in just one click.
The main functions are:
Flashing to lower CAS version
Restore back to original version
Read ISN, make keys for non-supported CAS (eg-938XXXX,939XXXX)
For making keys, reading ISN and changing VIN for CAS which comes with specified part numbers given below will not work just through direct reading. CAS Firmware function should be done to make it work. CAS firmware can do it in just one click.
Part numbers which needs flashing
BMW Nr: 9262360, 9262361, 9267608, 9267609, 9287534, 9287535, 9278745, 9278746, 9389115, 9389116, 9395656, 9395657
Go to CAS firmware from AUTOHEX and you can check the status of CAS, whether it is downgraded before or not on the details provided about CAS on the page.
Before starting to read all the messages and warnings carefully and make sure you are keeping up the required conditions given as IMPORTANT.
Part numbers: 9389115, 9389116, 9395656, 9395657 after downgrade may show some fault codes and car won’t start (fault codes AA0A and AA0B).it can be solved by restoring the flash back to original.
Always make backup using tools like BDM before doing CAS firmware for these part numbers
Restore to original flash
The downgraded CAS can be easily restored back to its original version using CAS firmware. For some part numbers it is necessary to restore back to its original version for the proper working of car.
After carrying out all your operations (read ISN, make a key, change VIN,...), for going back to original version go to CAS firmware and do the following steps
In CAS firmware window you can see that the CAS is already downgraded and it is possible to restore it back to its original version.
Click on start and wait for few minutes to complete the automated flashing process by AUTOHEX