[btcoolmi]

Originally Posted by MyFone Shop

samsung B7510 hard reset

1. Press and hold the “Power/Lock key” and “T” key of the QWERTY keyboard at the same time until the “Android system recovery” menu shows up.
   　
   　
2. Use the “Volume key” to scroll down and select “wipe data/factory reset”
   　
   　
3. Press the “Home key” to proceed to the next confirmation step.
   　
   　
4. Use the “Volume key” again to scroll down and select “Yes — delete all user data”
   　
   　
5. Press the “Home key” to perform hard reset. All user data will be removed and the device will be restored to manufacture default.
   　
   　
6. Press the “Home key” to reboot system.

your device is restored to factory setting

link is here

it is ok this method i use this to resolved many password who ask name user and password. thanks bro