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How to Hard Reset BlackBerry 9900 Bold Touch BlackBerry Dakota BlackBerry Magnum
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.