To unlock blackberry curve 8520 password screen, you must entering any password 10 times and your blackberry automated erase all your data and you can setup new password for your phone. But make sure you have backup data before you doing that since after your blackberry unlocked there is no chance you can save your previous data.
For your case, you can use your PUK code to unlock blackberry curve 8520 password, just type any password until your phone asking you to enter puk code. PUK code can you found from your sim card bundle if you don't have it just call your service provider, they will give it to you. After you put that puk code your blackberry unlocked from old password.
You can try this site. it will help you. Simpleunlocking.com
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