system is as follow
Asus Crosshair V Formula-Z
amd fx8370
16GB corsair XMS3 ddr3
Asus GTX 660 Ti
Intel 530series SSD (to be the boot device)
sony 8GB flash drive (windows 10 x64 install files formatted for GPT)
I have tried 3 diffferent USB flash drives (all of them were previously working), my x99-deluxe DOES see them as UEFI boot devices.
I have installed windows 7-10 on this exact hardware a number of times in the past, I have no idea what is wrong. I tried messing with secure boot and CSM I dont get whats wrong. It did this on bios 2101 AND 2201 (the most recent update). any advice?
SOLUTION. I could only get my ASUS Crosshair V Formula-z to boot UEFI media if it was formatted in FAT32.
Update.
I changed bios versions to version 1901. I can see the UEFI Memtest usb. but not my windows 10 ones.
Im going to remake the USB with an older version of RUFUS and see if it makes a difference.
last I changed my gtx 660 Ti for a 780 Ti from my main rig, and I unplugged the front usb3 header and my usb2 headers just in case.
at the very bottom in Uefi under advanced and boot do you not see the flash drives listed. On my A88x I can not set these as 1st boot but if you click one of them it will start to boot from that device. Mine rarely shows what is on the device but it works every time.
I see them listed as legacy devices. the UEFI: USB NAME is not there its just USB NAME. when I boot off of it it is clearly not in UEFI mode. if I turn off the legacy boot. it tells me that there are no UEFI devices at all
this is what I see. none of my devices get the UEFI option. I have in the past I dont know what changed.
I can only get ONE flash drive to show up as UEFI. and its only 254MB so I cant exactly get windows onto it.
I am no pro at this stuff but will try my best to help.
First the flash drive is format to fat32 and with gpt not mbr correct?
Also, sometimes I find that the usb port I stick it into matters. Not always but sometimes
I was using NTFS for all the usbs. im going to try fat32 on one, Ive never used FAT32 for a install Usb but maybe it will work
I have only used fat32 for install
so I checked and my Windows 8.1 USB was actually FAT 32 and myt CHV-Z was able to see it in UEFI. I have no Idea why my CHV-Z cant see NTFS boot media but my X-99 deluxe can. I am installing Windows 10 11082 right now, thanks for mentioning FAT32 I would have never checked that in a million years.
You are welcome. Like I said, I am not a pro but together on the forums we can find a solution usually
