Succesfully read data from edc16c9 (opel vectra c 1.9cdti) with Launch X431 IMMO Plus xprog3 and mcu3 adapter. At least to get a connection you have to connect all cables like in manual and power up xprog3 cable and mcu3 adapter together, I mean one supply cable for xprog and second for mcu3 adapter. I also used usb connection between tablet and diagnostic device. Hopefully it will help someone.
Tutorial: how to unlock BMW CAS3++ istap PCF7935 remote key with Launch X431 IMMO Plus / IMMO Elite . Procedure: Go to IMMO- BMW latest software – Anti-theft key matching- Anti-theft key matching- CAS3/CAS3+ IMMO- Key Operation Read key status. Put the key to the X-prog3 coil. The current key has been locked. Go back to CAS3 key operation menu. Select Key Unlock. Put the key to be unlocked into the X-prog3 programmer. Click OK to load a copy of key data file. Unlock key successfully. Now the key can be used again. http://www.key-programmer.org/2025/09/23/unlock-bmw-cas3-istap-key-with-launch-x431-immo-plus/