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  1. #1
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    Maximus XII Apex (Z490) Flashback light won't turn on, can't boot

    Something is seriously amiss with my mobo. I can't switch from bios a, the flashback light won't turn on when I try to flash bios. I've removed ram, gpu, unplugged everything except the panel buttons and power (my system drive is an M.2 NVMe that's still installed). I've tried power off at the psu, unplugging psu, removing cmos battery for ten minutes, nada.

    I've already had to RMA this board once (was my fault, nothing against Asus) and I'd hate to have to try RMAing again.

    Any help would be most appreciated.

  2. #2
    ROG Guru: Green Belt Array geneo PC Specs
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    geneo's Avatar
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    I assume you have done this before and know of the naming convention for the BIOS file.



    Only thing I can suggest that you didn't mention to try is to reflash your current BIOS with an official BIOS using EZupdate.

  3. #3
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    Correct, I used the renamer program and ensured the file is at the root of the usb.

    I can't get into bios so can't use ezupdate.

  4. #4
    New ROGer Array EncodeGR PC Specs
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    Is your usb drive properly formated ? (FAT32)

  5. #5
    ROG Guru: Green Belt Array geneo PC Specs
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    MotherboardMaximus XII Hero
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    Quote Originally Posted by Falconeer5 View Post
    Correct, I used the renamer program and ensured the file is at the root of the usb.

    I can't get into bios so can't use ezupdate.
    Oh, you can't even boot your computer? Maybe RMA time, sorry. Read text not thread title.
    Last edited by geneo; 03-14-2021 at 04:29 PM.

  6. #6
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    Hello ,

    Does your motherboard LED/Qreader ON ? or just everything without power ?
    rest everything [ unplug then plug everything ]

  7. #7
    ROG Guru: Green Belt Array geneo PC Specs
    geneo PC Specs
    MotherboardMaximus XII Hero
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    Yeah, if the motherboard is getting power, maybe the flashback LED is dead. You could try pressing it , then waiting 5 minutes just to make sure.

  8. #8
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    Quote Originally Posted by geneo View Post
    Yeah, if the motherboard is getting power, maybe the flashback LED is dead. You could try pressing it , then waiting 5 minutes just to make sure.
    It's harder that QLED defective without reason .

  9. #9
    ROG Guru: Orange Belt Array Saltgrass PC Specs
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    Could I just verify what you are attempting?

    You put the renamed Bios update on the flash drive and plug it into the correct USB port while the system is shut down.

    You then hold the Bios Flashback button for three seconds until the light blinks 3 times. The Clear CMOS light is the only light on on the back.

    If the system has two Bios chips, does it make a difference as to which one is chosen for booting?

    If the Bios update fails or leaves the system in an inoperable state, it can be recovered using the special CrashFree utility..

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