Sounds like immo problem. If it is immo then if you turn on ignition and wait 10 sec and then try to start it will not start. If you start it straight after turning on ignition it will start but stall in 2-4 secs.
Is there any fault codes in ECU or immo?
If your friend did immo off in ECU software there would be no need to use immo box at all but that is a memory soldering job. Do you have original key to use with immo box? You might need to pair immo box with ECU or key.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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