[emhtuning]

I tried aif schrieben to write vin the uif but it doesn't let me write there vin there

cant seem to find any other command, I understand for the above method to work on ista p it needs to see the correct car vin number to detect the correct firmware for the car vin and ecu

is there any other solution

ISTA-P doesn't decode the car specs from the VIN but from the FA stored in CAS and LMA , 

why are you using AIF Schreiben , that's not the correct command to use for VIN writing.