Does simply turning the phone off and back on accomplish a reboot, or is there more to it than that? Yesterday I let the phone go all the way down, then charged it up to 100%. I turned it off, disconnected from the charger, turned it back on, and then set it down and didn't touch it again until this morning. After 18h, 16m on battery with no use whatsoever, I'm down to 22% battery life. Task monitor shows that 97% of the battery went to Android OS and 2% went to phone standby, and that's it. When I was on 2.3.4, I would have 60-70% battery left after this much time. There's clearly something wrong here. How do I revert back to a previous version of the OS? For now I'll let it go the rest of the way down and then pull the battery and replace it before recharging, but if that doesn't do it then reverting to the previous OS may be the only thing left.