I've developed an issue since the last Android 10 OS update where the phone doesn't charge unless it's in 'USB Controlled by device' mode, which it usually fails to switch to. I'd like to try flashing stock firmware to it, as resetting to factory default didn't fix the issue.
I've tried downloading a stock firmware file and using the recovery mode option to install from SD card, but alas the timestamp on the file was older than the current OS, and so it refused to downgrade.
Since I'm a complete newbie to the android hacking world, I'm looking for an easy to understand solution to install a fresh stock firmware / ROM (not sure what the nomenclature difference is) or failing that, backing up the existing firmware and re-installing that. Naturally, the phone isn't rooted nor is the bootloader unlocked etc, nor do I currently know how to do those things.
Any assistance would be much appreciated.