Samsung Galaxy Y Pro B5510 hard reset
Turn off phone first. Press Volume Up + HOME Key + power On together. After 10 seconds leave power key to enter in recovery.
Select Factory reset/ wipe data with volume key and Confirm with HOME key.
Go to Yes -- delete all user data press Home key. Phone will reboot.
All data will be lost!
Normal reset B5510 soft reset reboot your phone.
If your device has fatal errors or hang-ups, or freezes, you may need to reset the device to regain functionality.
Reset the device (press and hold Power/Reset/Lock key for 8-10 seconds and release)
Or go to Menu > Settings > Privacy > Factory data reset: Reset your settings to the factory
default values and delete all your data.
Your device freezes or has fatal errors
If your device freezes or hangs, you may need to close programs or reset the device to regain functionality. If your device is frozen and unresponsive, press and hold [POWER key] for 8-10 seconds and release. The device will reboot automatically.
If this does not solve the problem, perform a factory data reset. In Idle mode, open the application list and select
Settings → Privacy → Factory data reset → Reset phone → Erase everything.
Use this method to hard reset your Samsung Galaxy Y Pro B5510: Enter *2767*3855#. Warning! All your data including contacts, messages etc. will be lost! Copy all your necessary data/Contacts/Messages etc. to SIM or make backup to your PC before full reset! Take out SIM card before full reset.