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  1. #1
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    Trouble Downgrading to BIOS 1301 from 1902 in PRIME X299-DEXLUE

    After upgrading my BIOS from 1301 to 1902 using EZ Update/USB I cannot seem to return to 1301. I first tried installing 1301 using EZ Update with a USB flash drive in the BIOS as I did for 1902, but it claimed the file X299D.CAP was "not a proper BIOS". I then used the flashback button on the rear panel. After that it would not post and there was a message "Code 05" on the motherboard's lcd. I then re-did flashback with 1902 and it still wouldn't post. I then hit the Clear CMOS (CLR_CMOS) button and it posted to 1902 (and I was very, very glad).

    I'd like to return to 1301 because in 1902 Hyper-V will not run. I've selected virtualization in the BIOS, Windows says virtualization in enabled in the task manager, but if I try to start VMs I get the message "hyperviosr isn't running". Everything worked in 1301. I may create a separate post on this.

    Suggestions very welcome on what to try next.

    I 'm wondering if I should try flackback with 1301 plus the cmos button if necessary as this seemed to help with 1902.

    Thanks!

    Motherboard: PRIME X299-DELUXE
    OS: Windows 10 Pro 1809 Build 17763.615

  2. #2
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    Update: I re-did 1301 with flashback and, for some reason, this time it worked without issues. And now Hyper-V works again. So all my issues appear to be resolved.

    Still curious why I couldn't use EZ Update for 1301, and why I couldn't post after the previous flashback update.

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