How To Reformat (Lenovo Edition)

1. Back up your files in the laptop to an external hard disk, etc.
2. Prepare an empty 8GB pendrive.
3. Turn off laptop and insert the pendrive.
4. Turn on laptop and go to BIOS.

To go to BIOS:
Method 1
1. Restart and press fn + f2 upon lenovo start screen.

Method 2
1. Go to Settings > Update & Security > Recovery > Restart Now
2. Troubleshoot > Advanced Options > UEFI Firmware Settings > Restart

5. Under Boot > EFI, rearrange the list to make the USB as the first on the list.
6. Save changes and exit the BIOS. It will restart automatically.
7. After restart, format pendrive (for future use) and eject pendrive.