Rather a bad case of letting the smoke out. Almost impossible to get it all back into the micro containers once its out like that.!!
Almost looks like moisture (or perhaps some creature) got on the board & flashed over ?
I have some LN-10 Flux Remover/Cleaning agent if you want to borrow to clean up the board to try and ascertain what caused the failure, it will remove all that carbon like it was never there.