I had this issue as well, you just need to switch to a wired mouse while in the EFI BIOS as some wireless mice don't work correctly. For example mine only moves up and down (if I move left to right)
Also, I have been able to make all changes using the keyboard so far, so you don't have to have a mouse.
Also, I have been able to make all changes using the keyboard so far, so you don't have to have a mouse.







