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- Windows 11 Pro 24H2 (Build 26100.4351)
And why I said what I said in agreeing with you. However, where no issues exist, this is an unnecessary step.There's always a good reason to unplug everything not needed, especially in cases where there already are issues with USB-ports. Normally it's not necessary, but in this case I think it's vital. We don't want a failed flash to occur because of some power interruptions in the ports.
That said, and given your issues, I can fully understand where @SlicEnDicE is coming from so it's worth a try, though under normal circumstances, it's unnecessary.
Hmmm....

My board's owner's manual (Gigabyte Z390 Aorus Xtreme) (PDF). Page 22, in reference to the image on page 21....Okay some misinfo here regarding flashing. Please guys get it correct. There is NO specific USB port you have to use with Q-Flash. Any USB port will work and you can even have the bios on a hard drive. Q-Flash Plus however must use the specific USB port designated for Q-Flash Plus. This is made clear in the manual. Q-Flash Plus is designed to used on a motherboard powered off state with power connected...as in not booted up.
Q-Flash Plus is similar to Flash Back on other motherboards.
USB 3.1 Gen 2 Type-A Port (Red) The USB 3.1 Gen 2 Type-A port supports the USB 3.1 Gen 2 specification and is compatible to the USB 3.1 Gen 1 and USB 2.0 specification. Use this port for USB devices. Before using Q-Flash Plus, make sure to insert the USB flash drive (Note) into this port first.
Op's board...
OP's owner's manual (Gigabyte X570S Aorus Master) (PDF). Page 21, in reference to the image above. (PDF file)USB 3.2 Gen 1 Port (Q-Flash Plus Port)The USB 3.2 Gen 1 port supports the USB 3.2 Gen 1 specification and is compatible to the USB 2.0specification. Use this port for USB devices. Before using Q-Flash Plus (Note), make sure to insert the USB flash drive into this port first.
Suggest the OP stick to the script and use the port listed for Q-Flash "Plus" for problem free issues.
And uh, yeah, I've done quite a few Q-Flash Plus updates - with the PC powered on (booted into the BIOS) not the OS

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- Intel Core i9-9900K
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- Gigabyte Z390 Aorus Xtreme
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