Re: can't sync anymore
Try another battery pull. Do it with the power on and wait a good minute or two. While you have the battery out, also remove the micro SD card if you are using one. See what happens.
If no joy and if you have OS 4.6 or newer, see if you can boot up in safe mode (search). If so, do a full backup, delete any programs you recently installed that might be the problem, change to a stock theme if necessary, and see if you can boot up. You probably should consider wipe and OS reinstall, however.
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