Autohex II BMW Key Programming Autohex II is the best solution for those who are looking for a single tool that solve all cases in BMW key programming. With the equiped functions for key learning in BMW software, users can read, write, block, unblock,save and delete any key in the CAS. Autohex II is advanced tool for Encrypted CAS (CAS3+), users can add new key with or without working keys available for all versions of CAS3+. After selecting Key learning from the left list, user will get a list of available functions.