WARNING! When you factory reset your phone, all data stored on the device’s internal memory will be deleted. This includes apps, ringtones, contacts, media files, downloaded content etc. In addition, all settings will be restored to factory values.

NOTE: Data stored on the SIM and SD cards will not be affected. For instructions on how to back up data from the internal storage, visit this thread. For instructions on how to restore data, visit this thread.

Factory Reset via Settings:

  1. Open “Settings
  2. If necessary, access the “General” tab
  3. Tap “Backup & reset
  4. Optionally, clear or tick the check boxes associated with “Back up my data” and “Automatic restore
  5. Tap “Backup account” and sign in with your Google account if necessary
  6. When ready, tap “Factory data reset
  7. At the prompt, select whether to “Erase SD card” during the factory reset
  8. Tap “Reset Phone” > “Next
  9. Tap “Delete all” > “OK” to confirm

Factory Reset via Recovery:

NOTE: In case your device crashes, freezes, or doesn’t allow you to reset your phone via settings, you can reset the device from the Android System Recovery menu. To do this:

  1. First turn the phone OFF if necessary
  2. Press and hold “Power” and “Volume down” simultaneously
  3. At the “LG” logo, quickly release and re-hold “Power
  4. Release all buttons at the “Factory data reset” screen
  5. Next, press “Volume down” to highlight “Yes
  6. Press “Power” to select the highlighted option
  7. At the “Erase all user data and restore default settings” prompt, tap use “Volume down” to highlight “Yes
  8. Press “Power” to confirm

Check for OS Updates:

NOTE: After your reset your phone, it’s recommended to check for OS updates:

  1. Open “Settings
  2. If necessary, access the “General” tab
  3. Scroll to and tap “About phone
  4. Access “System info
  5. Check if an update is available. If applicable, follow the on-screen steps to download and apply available updates

See More: LG K4 (2017): Factory Reset via Settings/Recovery; Check for OS Updates