After update my Lumia 1520 turns hot after a few minutes of use (whats app, line, facebook, no games) and the performance now is really poor including the battery life. Any solution?? i think is a bug in the update =(
Factory Unlocked Lumia 1520 C. V. Hong Kong W. O. Cyan update
First try a soft reset. Maybe even several soft resets.
If that doesn't work, open Battery Saver, Usage, and see which apps are eating battery. If there's just one or a few, uninstall/reinstall.
If that doesn't work, hard reset. Sometimes restore from backup is okay, other times you need to reinstall everything from scratch.
If all else fails, use the Nokia Recovery Tool to reset to WP 8.0 and start over.
Yes, everything after soft reset is a pain. You have my sympathies. Good luck!