Cannot Install Bazzite

Hi, I've been struggling to successfully install Bazzite on my custom desktop and could really use some help. Key specs:

CPU AMD 5700X3D
GPU AMD 5700 XT (was RTX 3070, see below)
MOBO MSI B550 Mag
RAM Gskill 2x16Gb 3600 Ryzen edition
SSD Samsung 990 Pro 2TB M.2
Ethernet connection
Note - no dual boot, SSD is to be dedicated to Bazzite
Note - secure boot disabled

When trying to install the Bazzite image (AMD desktop, KDE, no Steam gaming mode), I have been using Fedora Media Writer onto a Samsung USB 3/3.1 flash drive (tried 2 different drives). In both the live iso and legacy iso images I get to deployment until I receive the "no-signature-verification exited with code 1" error per the first attachment.

I have tried the code 1 troubleshooting step of removing the EFI folder, but when I do there is no EFI folder to remove. I've used the SSD erase tool from my motherboard to ensure it's starting clean (verified in the installer when I see no existing partitions) and I get the same error.

I have also tried installing Fedora Kinoite and get to deployment in anaconda where I get "failed to pull from repository" per the attached image.

Previously I had bazzite "working" with a variety of crashes after successfully installing a couple months ago with my RTX 3070 installed. I was getting opengl related errors and was hoping swapping for an AMD card would fix those issues. When I replaced the card and booted up for the first time I didn't have any new issues, but wanted a clean install instead of rebasing to see if those other issues went away.

Thank you so much for your help!
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