"Hardware Error" will always mean that the Sync 4 APIM is not communicating with the ACM for one of two reasons:
1. The ACM that is installed is not compatible, not the X65 version.
2. The APIM is not communicating to the X65 version ACM due to wiring.
APIM PIN 27 CTRL MOD. - BLUETOOTH/MULTIMEDIA GATEWAY MODULE # DRDL_TX_+ [MATES] ACM A PIN 5
APIM PIN 28 CTRL MOD. - BLUETOOTH/MULTIMEDIA GATEWAY MODULE # DRDL_TX_- [MATES] ACM A PIN 4
