Samsung GT-i9100 Galaxy S2 hard reset with buttons Galaxy S2 factory reset after rooting

PRESS AND HOLD VOLUME UP + Home Button

Keep pressing these 2 buttons + press Power button for 2-3 Seconds
Release only power button, but KEEP pressing Volume up + Home Buttons
With Volume down select wipe data/factory reset (3rd) > Press Power
(VOLUME UP + HOME + POWER buttons)

OR

Your Samsung Galaxy SII 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  for 8-10 seconds. 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.
OR
Use this method to hard reset your Samsung Galaxy S II 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 on your PC before full reset!
OR
1. Turn off the i9100 S 2 phone or take out the battery and reinsert it.
2. Hold the Volume Down button
3. Press and release the Power button
4. Select Clear Storage by pressing the Volume Down button
5. Press and release the Power button
6. Press Volume Up to confirm i9100 master reset
I9100 Download mode when you reflash galaxy s2 firmware, root
Turn off i9100. Press and hold VOLUME Down + HOME + POWER buttons together.

Symbian Applications

                                           

Samsung GT-S6500 Galaxy mini 2 hard reset

Press volume up & down & power - when the phone vibrates IMMEDIATELY press the home button and after 2-3 seconds release the power button... What you're going for is that the phone tries to restart with volume up & down & home button pressed...

Press and hold both Volume UP and DOWN + POWER ON / -->( HOME ).
Select Factory reset with Volume Down button and press Power to reset. All data will be lost!
or
Turn off S6500. Press and hold POWER + ENTER button for reset menu.
Select Factory reset with Volume Down button and press Power to reset. All data will be lost!
or
Use this method to hard reset your Samsung GT-S6500 Galaxy mini 2 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.
Samsung GT-S6500 Galaxy mini 2 download mode if you want to install eg. Gingerbread
Press and hold Volume DOWN + HOME + POWER ON S6500
Restart your device to clear any temporary software bugs
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] for 8-10 seconds. 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.
Clear storage
• : Erase the credential contents from the device and reset the password
Set an unlock pattern
Once you set a screen lock, your device will require an unlock code each time you turn it on or unlock the touch screen
Settings → Location and security → Set screen lock → Pattern
If you forget your PIN or password, bring your • device to a Samsung Service Centre to reset it.
Set an unlock PIN code
Settings → Location and security → Set screen lock → PIN
Set an unlock password
Settings → Location and security → Set screen lock → Password.
You can hard reset software firmware update your Samsung GT-S6500 Galaxy mini 2 phone: Connect with Samsung Kies
S6500 firmware upgrade Android. You need this key combination if you are going to upgrade your S6500 android firmware.
Press and hold Volume DOWN + HOME + POWER ON S6500 This is NOT the hard reset. See reset procedure above.