These ISOs have an issue that affects AMD cpus, see this thread here:
You have a few options:
- Use the ISO from the downloads page (this is the easiest option available to you). The ISO builds page you got those files from has all recent ISO builds, including testing ISOs or ISOs that have issues we haven’t addressed yet. Often those ISOs are fine to use, but in your case there is an issue we haven’t addressed.
- Fix the issue yourself by chrooting into the system after installation and add this line to
/etc/default/grub:
GRUB_EARLY_INITRD_LINUX_STOCK=''
See also this related commit here: fix(boot): don't load microcode via GRUB (ff149a75) · Commits · Garuda Linux 🦅 / Tools / garuda-tools · GitLab
Some folks have also reported success installing amd-ucode-git from a chroot after the installation is complete (see the linked discussion above), although this seems to fix the issue by coincidence instead of actually addressing the problem.
- Wait for a new ISO to be released.
I hope that helps, welcome to the community by the way. 