Spice Mi-351 Google Account & Pattern Lock Done

1. Mobile Switch Off

2. Volume Down + Power Button In Hold 10 Sec

3. Fastboot Mode In Display

4. Android Multi Tool V1.02 Open

5. Press '8' And 'Enter' Button In system keyboard

6. Mobile Reboot now

7. Thats All

Samsung B5330 Hard Reset

1. Mobile Switch Off

2. Volume Up + Power In Hold 10 -20 Sec

3. Display In Recovery menu

4. Press Volume Down Select Wipe Data / Factory Reset

5. Ok Then Power Button

6. Press Select Confirm Yes- Delete All User Data

7. Ok Then Power Button

8. Confirm Reboot System Now 

9. Ok Then Power Button

10. Thats All

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