I can't update my Nexus S, shows error screen. What to do? Possible Duplicate:
  can&#39;t update, can&#39;t do a factory reset  




My Phone (Nexus S) keeps pestering me to update the OS. But, every time I try, it restarts, displays the cute robot error screen and doesn't come back on until I take out the battery and restart it. I would just leave it but I'm still running Android 2.3.4, and it's time. 

Any way of updating the OS other then clicking OK when it asks?

I'm not really sure what more info I can give you guys, ask and I will tell
When you see cute robot with the red triangle, press power + volume up together to get to the recovery menu, and select "update from /cache" or something similar you'll see there. Then the update process starts and, most probably, gives you some error messages about what's wrong with your phone.

If you have ever changed any system files, update process might require you revert them to the original condition before upgrade, otherwise patches cannot be applied properly.