I've no idea sorry mate, the one thing you will probably get told by everyone though is to ditch MFi and go EFi as its a lot more reliable if its being tinkered with
The EFi parts can be had for very little money, free even if you sell MFi stuff and theres a wealth of info all over the place about EFi swaps.
Probably not the response you were after, but hey, at least you're not being ignored!