Soft Reset LG P970 Optimus Black

First method:

  1. Press and hold the Power button until the phone turns off. Hard Reset LG P970 Optimus Black
  2. Wait a couple of seconds.
  3. Press the Power button again to switch the phone back on. Hard Reset LG P970 Optimus Black

Second method:

  1. Remove the back cover and the battery for a short while. 
  2. Put the battery and the cover back in. 
  3. Turn on the phone by holding the Power buttonHard Reset LG P970 Optimus Black
Help! This doesn't work