I screwed up big time....

[max]

Good point jtopiso, we know that one ecu has survived a polarity change ( the 20A fuse operated ) so that is good news.

Several years ago i had no idea how fuel injected engines worked, i got interested and have learned some things,
turns out it was not all that difficult after all, the trick is not to get mesmerized by too many sensors, just look at one at a time.

It all starts with the crankshaft sensor, it basically is a switch, as the crankshaft rotates the ecu recognizes the gap in the teeth, realizes that is top dead center, resets itself to zero and then starts counting the teeth; it is programmed to fire on the second tooth and inject on the fourth tooth
( i made the numbers up but the principle is the same )
Not too dissimilar to old style contact points;



So then the ecu is programmed to fire the injection and the ignition coils respectively as it counts the teeth on the ckp sensor;



So in this case you can forget about all the other stuff on the bike ( except for the fuel pump ) because you proved it runs fine with starter fluid and just make sure the basics are working as they should.
No point in replacing a lot of parts if the injector supply is not correct, it will never work unless you diagnose the actual cause.

Hope this helps to simplify things, have a quiet coffee and make a plan, if you can work out camshafts you can definitely handle this, we are looking over your shoulder.....