Hey Noor!
One thing that I learnt a couple of days ago, and seems to work for most of
the problem:
1) power off your phone (maybe by taking out the battery)
2) press volume up button first and then power button. keep on pressing
both untill you boot to a recovery mode (orange screen greets you).
3) move up and down with volume up/down keys & select with power button
4) select the third option (wipe data/factory reset).
it worked fine for me and avinash facing the same problem.
Please try it and post your results, if it did not help, someoone may be
able to help you!. :)
Regards
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--
Avash Mulmi
Mozilla Representative, Nepal.
http://www.avieezcorner.com
@avashz
http://www.facebook.com/avasz
Support Mozilla Project :)