Repeated flashing of my generator

[barrycc]

Hello. I have a Generac GP7500E & have to keep flashing it to get it to generate.
Replaced the AVR; but it puts out power ONLY after I flash it with a drill.
When I turn it off & start it back up--nothing until I flash it
Will flashing it with a 12V battery better restore the residual magnetism ?
Should I 'load it up' to max 7500 watts ?
Would really like to fix this
Thx in advance for any tips & help