Does reversing the battery polarity blow the ECM

[warp9.9]

After waiting for my neighbour for weeks to have a look at this no spark issue ( he is an Auto electrican) The problem was down to a dead crank angle sensor. So i can say for sure that reversing the battery on a rocket doesn't blow the ECM. I now have a bike that sort of starts after 20-30 sec's of cranking a few coughs and then finally runs and idles. Once its hot it runs fine. Anyone have any thoughts?

I'd say a Full ISCV reset is in order and a reset of the adaptives. See how the tps and stepper motor are set.