Mostly we all face a lot of problems in our own phones, despite the technological advances reached by the manufacturers of phones this but the process an error occurs and stop the phone without any justification is contained and strongly these companies not find a solution to these problems yet.
The final is always the case that the user restart the factory settings, which is not good because of the loss of data and everything will be present on the phone at this time.
How to Hard Reset BlackBerry 9520 Storm 2
Remove and insert the battery into your phone.Press Power button until your handset is on.
if phone is not response then following step:-
Security wipe From the Settings Menu
Go to the device options.
Tap on Security and Privacy
select general settings.
choose menu keys.
Tap on Wipe Handheld.
Select the include third-party application check box to delete all third-party apps.
Now select Continue.
Then put in the word blackberry and select OK.
Then process should now begin to erase the data.