A couple of days ago, I was backing my phone up through Kies and it said an update was available. I didn't use Kies to update my phone though as I wanted to back up my data first. I disconnected from the laptop and did an OTA upgrade.
Since the upgrade, my phone keeps locking up/freezing. The gallery app freezes constantly. If I try to attach a photo to a Fabecook post, it freezes my phone and in all cases, the only way out is to restart my phone.
This update has left my phone worse than useless. I can't do anything on it without it freezing.
I've tried factory reset quite a few times. I've wiped cache partition a few times. I've taken the SD card out. Nothing works.
I've read that the new bootloader renders it impossible to downgrade.
If I find an official 4.3 Jellybean firmware, will I be able to revert back to Jellybean by flashing it through Odin?
Otherwise, I'm stuck with a phone that no longer works.