Updating att tilt
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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.
This doesn’t apply to files that are on a removable memory card.
Resetting Your Device Occasionally, you may need to reset your device.
A soft reset is also necessary after the installation of some programs.
If a soft reset is performed when programs are running, unsaved work will be lost.
If you are using rooted device, always back up your EFS folder first, containing your IMEI info, etc.!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.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.
After the procedure, copy your files back to the storage card. Press and hold the left SOFT KEY and the right SOFT KEY, and at the same time, use the stylus to press the RESET button at the bottom of your device. Release the stylus, but continue pressing the two SOFT KEYs until you see the following message on the screen: Your device will be set back to factory default settings.