ASUS ZenBook won't recognize external DVD-drive in BIOS

WilliamBlake

Prominent
Mar 23, 2017
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Hello everybody,

my ZenBook was getting repaired and they re-installed windows 8.1 (which was originally installed first, but then i installed win10). Now I want to restore a sytem image (with Win10) with the windows recovery disc, and my ZenBook doesn't have an internal DVD drive, so I bought an external USB-DVD-drive. The problem is, it won't show up in the boot section of the BIOS. There is only one available option, "Windows Boot Manager". When I try to add a new option, it only shows my internal hard drive filesystem. "Launch EFI Shell from filesystem device" just prints out "Not Found"

I already disabled fast boot, enabled CSM and updated the BIOS to its latest version.
I really don't now what else i could do now.
 

Leslie25

Commendable
Nov 14, 2016
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some external dvd drives use 2 USB ends to plug into your ports to power it up

https://www.google.ca/search?q=external+dvd+drive&source=lnms&tbm=isch&sa=X&sqi=2&ved=0ahUKEwjShaPGuu3SAhWKx4MKHT7iCA4Q_AUIBygC&biw=1715&bih=834#tbm=isch&q=external+dvd+drive+cable&*&imgrc=B_rYEY45Uq8CfM:


make sure your USB ports have power to them even

try a different port, try a new cable?

you shouldnt have to clear the cmos but even maybe try that?

when u plug the dvd drive in, does it light up or anything?
 

WilliamBlake

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Mar 23, 2017
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Okay, I tried 3 different cables now, still the same, I also tried all ports. The DVD drive lights upt on startup and i can clearly hear it spinning. Unplugging and Replugging also doesn't change anything.
How do i clear the CMOS?

And i recognized something else; when i start the "easy flash" utility in the BIOS, it shows the DVD in the filesystem, if it helps anyone
 

WilliamBlake

Prominent
Mar 23, 2017
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Could be the drive, but it does get recognized by windows, and also by my other PC, so i don't think the problem is there. I just tried a USB flash drive, and it also doesn't get recognized
 

WilliamBlake

Prominent
Mar 23, 2017
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Okay I fixed it.
I enabled "Legacy USB Support" and "XHCI-Pre-Boot Mode" and now it shows the DVD drive and also the USB flash drive. Thanks everyone!
 

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