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

PRESS AND HOLD VOLUME UP + Home Button

Samsung i9100 hard reset using buttons
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
highlight again Yes -- delete all user data and confirm using POWER. All data will be lost! Make sure you back up your data before doing a factory reset!

(VOLUME UP + HOME + POWER buttons)

Samsung i9100 hard reset using 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 Samsung GT-i9000 Galaxy S hard reset 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 or ODIN mode - when you reflash galaxy s2 firmware, remove password or unlock pattern, root your SGS2 or download custom binary firmware

ODIN v3.10.7 (latest version in 2015 december)
odin firmware flash small

Note: you can also reset your I9100 Galaxy S2 phone remove unlock pattern or password if you completely reflash your phone.

1. Turn off i9100.
2. Press and hold VOLUME Down + HOME + POWER buttons together. Then you need to connect your phone to your PC running KIES or ODIN software. ODIN v3.10.7 (latest version in 2015 december)
3. Download your network specific version of the firmware and unzip it.
4. Browse it in ODIN using the AP button.
5. Check and untick re-partition under option tab. The default is unchecked, so it is ok.
6. Hit START and it will reflash your firmware.

Firmware versions for your Samsung Galaxy S 2 i9100 Andorid phone
Find your network specific (SIM lock) or generic (SIM free / unlocked) firmware version for your Samsung i9100
(Note: we are not hosting any of these firmware files. Go to sammobile or google for it and download from the www)

GALAXY S II (GT-I9100P)
GALAXY S II (GT-I9100G)
GALAXY S II (GT-I9100)
GT-I9100 (GALAXY S II)
GT-I9100G (GALAXY S II)
GT-I9100M (GALAXY S II)
GT-I9100P (GALAXY S II)
GT-I9100T (GALAXY S II)
I9100XWKE2 / I9100OJVKE3 / I9100XWKE1 / I9100XWKE2 (Unknown  - DAM)
I9100XWKF3 / I9100OJVKF1 / I9100XXKF1 / I9100XWKF3 (Kenya  - AFR)
I9100JHKJ1 / I9100PTRKJ1 / I9100JHKI2 / I9100JHKJ1 (Israel (Orange / Partner)  - PTR)
I9100UHKG7 / I9100UWAKG2 / I9100UHKG4 / I9100UHKG7 (Puerto Rico  - PCT)
I9100UHKG7 / I9100UVCKG2 / I9100UHKG4 / I9100UHKG7 (Argentina (Claro)  - CTI)
I9100UHKG7 / I9100SAMKG1 / I9100UHKG4 / I9100UHKG7 (Peru (SAM)  - SAM)
I9100UHKG7 / I9100UWTKG1 / I9100UHKG4 / I9100UHKG7 (Panama  - PBS)
I9100UHKH1 / I9100ANCKH1 / I9100UHKG4 / I9100UHKH1 (Argentina  - ANC)
I9100UHKG7 / I9100UWTKG1 / I9100UHKG4 / I9100UHKG7 (Ecuador  - EBE)
I9100UHKH1 / I9100VMTKG1 / I9100UHKG4 / I9100UHKH1 (Venezuela  - VMT)
I9100UHKI1 / I9100AROKI1 / I9100UHKI1 / I9100UHKI1 (Argentina  - ARO)
I9100UHKH1 / I9100COBKH1 / I9100UHKG4 / I9100UHKH1 (Colombia (Movistar)  - COB)

Before you buy a new cell phone or new tablet, please try the following procedure to repair your device. First charge your battery, backup your important data if possible and in most cases take out SIM and SD card before 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.!