BMW CAS Firmware

 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.

Autohex II CAS Firmware
Autohex II CAS Firmware

Important Note:

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.

CAS Firmware to restore flash
CAS Firmware to restore flash

Click on start and wait for few minutes to complete the automated flashing process by AUTOHEX

Restoring CAS flash
Restoring CAS flash


Last Update: 3/29/2019
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