If you are looking to reboot LG Optimus F3 into the recovery mode then you can do that with the help of this small post. Here are the instructions
What is Android Recovery:
Before you get into booting the phone into. A recovery mode, let us see that what android recovery really is. Android Recovery is a system menu which is installed on every android phone and it helps to perform many tasks in an emergency or otherwise which cannot be done from phone interface itself. It helps to do things like wiping the system cache, applying manual updates, flashing roms etc.