O2 XDA Zest hard reset: Press navigation UP + press...

Solved: How to hard reset O2 Xda Serra: With the device turned on, press and hold the VOLUME DOWN and ENTER buttons, then press the...

Solved: How to hard reset O2 Xda Ignito: With the device turned on, press and hold the VOLUME DOWN and ENTER buttons, then press the...

Solved: How to hard reset O2 Diamond: With the device turned on, press and hold the VOLUME DOWN and ENTER buttons, then press the...

Solved: How to hard reset O2 XDA Mantle: Press and hold the left SOFT KEY and the right SOFT KEY, and...

Solved: How to hard reset O2 XDA Nova: Press and hold the TALK and END buttons, and at the...

Solved: How to hard reset O2 XDA Star: Press and hold the TALK and END buttons, and...

O2 XDA Stealth hard reset: power off your O2 Xda Stealth and then press Windows key, OK key and the...

O2 XDA Graphite hard reset: push the joystick up and press the power key simultaneously while the...

Solved: How to hard reset O2 XDA: Press the battery switch once to turn it off, and then...

Solved: How to hard reset O2 XDA Argon: Press and hold the left SOFT KEY and the right SOFT KEY, and,,,

Solved: How to hard reset O2 XDA Atmos

Solved: How to hard reset O2 XDA Atom: Press and hold the power button, and then use the...

Solved: How to hard reset O2 XDA Atom Life: Press and hold the power button, and then use the stylus to press the...

Solved: How to hard reset O2 XDA Exec: Press and hold both SOFT KEYS...

How to hard reset O2 XDA Atom Exec: Press and hold the power button, and then use the stylus to press the...

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.