Windows 10: Problem Navigating The Bios

I've posted about this problem once before and now I'm at a critical stage. I'm running Windows 10 version 1903, on an Acer Aspire E15 ES-575 laptop. Some time ago, I had a situation in trying to navigate the Bios so that it would boot from USB or CD if I had a problem. I could not move around the Bios to get that done. I've worked with computers all my life, so I know how to use the arrow keys to get around. Nothing in the Bios can be changed and all you can do is "save & exit" once you are in there. I have flashed the bios in the past to see if that resolved the problem, to no avail.
Today when I started my computer it stated there was no "boot disk". Again, I entered the bios using F2 but could do nothing once I was in the bios. I was able to get it to boot finally by using Shift + F10??? I don't know what is going on and downloaded a "Create Windows 10 installation media" from the Windows site onto a USB drive knowing that whatever I have there is useless unless I can change the boot order.
I'm leaving this computer on for now until I can figure out what is wrong with it.
Can anyone help me? Thanks!!!

:)

 

bios

Hi all i am new in this forum, i need meanings step by step of each item listed in the bios Phoenix-Award

 

Problem Navigating The Bios

Unlikely, when you hit F2 to enter the bios it is before the HDD has been accessed. In fact, you could remove the HDD and still be able to enter the bios.

I have an Acer Aspire One with the InsydeH20 Setup Utility, Does yours look like mine?





If so, then you used the left/right arrows to move across the top menu. You don't actually enter each page, rather you use the up/down arrows to move the white highlight to the item you want, in this case I have highlighted the '2. USB HDD :'. Then the F6 key will move it up the list.

 

Powercolor RX480 BIOS required

Find the unverified bios option.