[hahn181]

did the same a while ago because I thought it would be some "calibration" reset or something... but note... you just have "divorced" the ecu. So just do the following its easy. 

so step by step:

“Body”→ “Programming”→ “Immobilizer Programming”

Click “Security Code” and enter security code

Click “Program Immobilizer Function” -> ECM installed.

it should take just some seconds and sometimes you already hear the fuelpump starting. 

now the immo-light in the dashboard should be gone. now do a ignition off -> wait about 30 secs. ignition on -> waiting about 30 sec.

and try to start. And make sure to do a complete faultcode scan + clearing afterwards. this cleans out any immorelated faultscodes in several ecus.

good luck