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First, swipe down and get the MENU.
Scroll down to Security And Privacy.
Scroll down to Security Wipe.
In Security Wipe, enter
as the 'password' for the operation, and click on
and it may take a while, but you will get a factory-condition Blackberry after that.
If the overall password ***** enter the Settings or the Menu is not changed, ask whoever you bought it from for it. If they don't know, then they have sold you something useless to you.
Unless this works:
1. have Blackberry Desktop on your computer.
2. connect the BB to the computer, and do a Backup of the data on it.
3. unplug the BB from the computer, and hold down the Power button on it to force it to power Off.
4. then while it is Off, with Blackberry Desktop still on your computer, connect it to the computer. You should see a prompt for
Retry? Update? Cancel?
and quickly choose Update.
That will wipe the Blackberry. I hope - these instructions are for a different, possibly older and less secure model.