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The passcode for a locked phone is usually the last 4 digits of your mobile phone number unless you changed it. I'm not sure what other passwords you might have. If that doesn't work, call customer service. You may have to take it to a retail store to have them reset it, but customer service may be able to tell you how to do it. If you need a password for customer service, you may need to take photo iD to a store to prove you are the account holder to have the password changed.
Admin Settings: *#6984125*# Admin Settings Internals (sub menu): *#9072641*# Developer Settings: *#0523# Camera test mode: Press *#36287# key string in the dial screen to enter camera test mode -  Auto focus [On]  ISP firmware write  ISP firmware version check
 Press the "1" key to disable auto focus. In order to enable auto focus, press the "1" key again.
 Press the "2" key to write the ISP (Camera Module) firmware. “ISP firmware write [Please wait]” will be displayed during 2 minutes. Then "ISP firmware write [SUCCESS]” will be displayed when the firmware upload finished.
Call your service provider and tell them what you typed in up there, they should give you a reset password then it would be working again. I had the same problem with my moto and nextel helped me out in 5 minutes.