my wife had lg g4 that develop overheat boot problem: by the time it booted it was overheated enough to reboot itself. in order to get everything off the phone

my wife had lg g4 that develop overheat boot problem: by the time it booted it was overheated enough to reboot itself. in order to get everything off the phone i froze it in freezer. it gave me enough time to boot it and copy everything via usb