Battery overheating after upgrade
 

Few days ago the service center upgraded my ? 8520 so now I'm using OS v.5.0.0.411. The old OS v.4.x I didn't remember the last number. I upgraded because suddenly with my old OS I can't open facebook, using application or browser..only facebook!
With the new OS everything is ok except the battery temperature. The battery overheating all the time..even when its standby. Its never happen with the old OS. And I never get fully charged battery again because the recharging process always stop by overheating. I did all "the first aid" like pull out the battery but it didn't help. I thought its just temporary but its been 4 days now and its still the same.
What should I do now? Upgrade to the newer OS or downgrade to the old?
I hope its not downgrade. I like OS.5..its faster than before

Wipe the phone and reinstall the OS.
You can of course go up or down in OS's; but you need to wipe and reinstall.