That is great news, half the problem is already solved.

did you manage to back up the whole firmware in a flush-able format where others can flash it on their T17/S17 boards to test it? if not then could you please seek some help from  thierry4wd , taserz or any other firmware savvy?

if you are not willing to do that, I might just buy the control board from you and have it sent to however is willing to extract and test the firmware.