T100AF BIOS Question

[Skyseek]

I need to boot off of the USB port, and when I looked at the BIOS I noticed an option under the Boot tab allowing me to select USB. My WIFI connection was not working so I restored from defaults. Now the ONLY option is Windows Boot Manager... No USB option. I need to boot off of USB to use third party backup software etc. Is ASUS trying to lock it down? Because Windows 10 performance is awful, so I would also look at loading Linux... Have to boot from USB...

Any ideas?

Thanks!

[randomuser]

This may work, its for T100TA, insert USB. Reboot, and start pounding the F2 button. The BIOS then shows more boot options than pressing & holding the power button + volume down button.