Error during updating Lumia 920

[WPCentral Question]

I was updating my lumia 920 a while ago. I made sure it had enough charge left in it also I plugged it to the charger (just in case). And the beginning steps of the update went fine. the last step where it restarts and installs the update is failing probably due to low battery. the phone is turning off n on for like the 50th time now! what do I do?
I'm hoping not to go to the care center since I would lose all my data. Any suggestions or solutions?