Samsung Galaxy Prevail M820 Android hard reset

1. Power off M820 Prevail or take out battery and reinsert it.
2. Press and hold VOLUME UP and POWER ON your phone.
3. When you see Samsung logo release ONLY Power button but keep pressing Vol UP.
4. When you see recovery menu release VOL UP button.
5. Select Factory reset with Vol down and press camera key.

Reset Samsung M820 Prevail recovery menu
5. Select Yes. Samsung Prevail hard reset

Resetting Your Phone
Resetting the Galaxy Prevail™ restores all the factory defaults, including the ringer types and display settings.
All data, including downloaded applications are deleted.

Important: Back up your important data before you perform a factory reset of the device.

1. Press Samsung M820 reset > and tap Samsung M820 reset > Privacy Samsung M820 reset> Factory data reset. (A disclaimer displays.)
2. Read the disclaimer and tap Reset phone.
3. Tap Erase everything to restore all factory settings.


Use this method to hard reset your Samsung Galaxy Prevail Android phone: 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.

What to do if you forget the Samsung M820 Prevail pattern:
If you fail to draw the correct unlock pattern on the screen after five attempts, a prompt displays and you must wait for 30 seconds before you can try again.
1. Tap Forgot pattern.
2. Sign in using your Google account name and password, and create a new screen unlock pattern.

If your M820 Prevail frozen just take out battery and reinsert it, then, position the battery cover over the battery compartment and press down until you hear a click.

Samsung Prevail reset

General advice: Before you buy a new cell phone or new tablet, please try the following procedure to repair your device in a software way. First charge your battery, backup your important data if possible and in most cases take out SIM and SD card before doing factory reset. It is impossible to recover your data after doing a hard reset, so online backup is always important. For all of your data, a backup should be done on an external device, hard drive, raid system or media. With or without insurance, if your cell phone lost, damaged or stolen at least your invaluable data is backed up in a safe place. If you are about to sell your phone and you want to wipe your personal data, or if your phone affected with virus you have to do a hard reset. In some cases, you can delete the forgotten password or lock pattern from your device as well. All information is for devices with stock based ROMs. If you are using rooted device, always back up your EFS folder first, containing your IMEI info, etc.! Please also note, that a hard reset operation will not unlock your mobile phone's SIM lock or network lock, but it will remove the unlock pattern, remove the user password or PIN password (NOT the SIM card's 4 digit PIN code). Also note that the firmware version will not be affected in any way, it will not be downgraded, it will remain the same you are using and if you have rooted your device, root privileges remain also unaffected.