It stands for Unified Extensible Firmware Interface. It has replaced many new age windows “Bios” booting (Basic Input-Output Systems).
Why this post?
Dual booting Windows/Linux distros can be a pain in the ass. Trying to spam Delete, Esc, F2 and other various stuff most likely won’t work – because your computer is too fast. Good problems? Well if you’re trying to boot from that Flash drive/USB, yea.
Here’s what you do (Windows 10):
1. Boot into Windows normally.
2. Go to Start
3. Click Settings
4. Select “Update & Security”
5. Select “Recovery”
6. Select “Restart Now” under Advanced startup
7. Upon booting, you’ll receive a “Choose an Option” screen, select “Troubleshoot”
8. From the Advanced Options screen, select “UEFI Firmware Settings”
9. Select “Restart”. On reboot you may/may not be prompted for a password. Enter it in.
10. Yay! You made it into UEFI/Bios. Whew. Arrow over to “Boot”
11. Arrow down once to “Boot Mode”, press F6 (fn & F6 if on a laptop), select “Legacy”
12. Hit F10, save and exit. Now you can at least reference get back into bios on restart and now change the Boot priority to Flash drive.
What a pain in the ass, right?