Found attached doc (02_F25 Powertrain.pdf). mmc99 is correct about needing to keep brake pedal depressed and not being able to test the procedure unless the vehicle won't start. This is only if you have power and is referred to as the "electronic" release procedure.
Otherwise, if no power, the "mechanical" release procedure (removing panel underneath vehicle and turning screw) must be used. I can only hope the people doing the towing understand it and are willing to do it, if necessary.
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2013 x35i (Space Gray, MSport, CW/CWII, DHP, Premium, Premium Sound, Technology, BMW-Apps)
Retired: '09 C300 4Matic, '09 GTI, '06 750i, '05 C55, '04 R32, '03 M5, '02 GTI, '01 M5, '00 M-Coupe, '00 540i/6, '99 M3 Coupe, '98 M3 Coupe, '96 328i,... '86 4000 CS Quattro... too many to list.
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