water damaged 5C stuck on recovery menu

Hello , i bought a third-hand iPhone 5c , the description said that the phone was stuck on recovery mode . When I received it it was working perfectely , no iCloud or any passcode . Then i tried to restore it and it doesn’t work , the phone reboot on recovery menu . :mad::mad:
I opened the phone and noticed the motherboard was water damaged , I replaced all pieces and nothing , the issue comes from the motherboard . I used ISOPROPANOL (99,9%) but no result that’s the same thing .

Can somebody help me ?? thanks :confused: