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.
LG Optimus Slider hard reset
When you can’t recall your LG Optimus Slider unlock Pattern, PIN or Password: 1. Turn the power off. 2. Press and hold the following keys for over 10 seconds: Volume Down Key + HOME + POWER. 3. You will enter the Android system recovery menu 4. Press Volume down Key to scroll to wipe data/factory reset and press MENU to select it. 5. Press Volume down Key to scroll to Yes -- delete all user data and press MENU to select it. 6. After the data wipe is complete, press the down Volume Key to scroll to reboot system now and press MENU to select it.
To reset your LG Optimus Slider phone to factory settings and erase all the data on your phone, touch Menu > Settings> Privacy > Factory data reset > Reset phone.
You can use LG Mobile Support tool to repair your LG cell phone, after download select menu Customer Support > Recovery Phone