Downgrade : (Windows 10 to Windows 8.1)

You Need :

> Bootable Flash Drive with Windows 8.1 Load.
> DVD, CD Rom with Bootable CD, DVD Windows 8.1 Load.

On Windows 10

1. Search: Settings
2. On Settings Type : Update & Recovery > Recovery
3. Advance Startup > Restart Now
4. Restart.
5. Click > Troubleshoot
6. Click > Advance option
7. Click > UEFI Firmware Settings
8. Restart.

On BIOS

1. Go to BOOT Option.
2. Set First Boot to : Flash Dive Name, DVD, CD Rom
3. Press : F10 > Yes.