UEFI installer crash/halt

Installed FreeBSD UNIX v14 or v15 on GigaByte X870 Aorus Xtreme AI Top (AMD Ryzen 9 9950X, 128 GB V-Color ECC DDR5 SDRAM). After BIOS update (which deletes unsigned kernels from boot list) when I boot v15 full USB flash drive (I think I booted before but might've been v14) I get this crash/halt not finding some things. Is it corrupted so I should rewrite flash drive and retry, or did something else go wrong?
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Thanks; took a look and will try some things... not 100% certain they'll work for my system-/logic-board or that this is solved yet (seems solutions were on other boards and this is ongoing).
 
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