Ok im new to this ecu stuff in some sense i have a golf gti 2000 aum its been remapped i dont know by who im prob the 5th owner i know its me7.5  . i have a cable kkl  with the ftdi chip i can read it on vcds - i think the immo is off to as i can read the intrement cluster and change the millage using vag k can commander using the kline (tested) i want to do a back up of the ecu flash just in case  and learn from stuff from there. im worried i will brick the ecu from low voltage any help please