Nick, You did not state which model of Oppo phone you have. Posted a couple ifixit guides below that show how to replace damaged mother board(guides state easy to moderate in R&R) hopefully will work for you if not try a search using your (make,model#,disassembly). Also do a search using your model # for a replacement board to see if cost effective. Good luck. I hope this helped you out, if so let me know by pressing the helpful button.
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