Howdy everyone. I just purchased the Aoostar WTR Pro with the Ryzen 7 cpu to upgrade my old server. This server will not boot the Unraid USB stick. I used the same Unraid USB in the old server and have tried all of the tricks that I could find (disable fast boot, switch between Legacy and UEFI, etc) and still it will not boot. I created a new Unraid USB with a different USB drive and it still will not boot. As a sanity check, I was able to boot from several other USB drives, a windows install, Ventoy, and other Linux distros. I have no idea why it will not boot the Unraid USB drive. Does anyone have any advice? Thank you in advance. 

Try to completely wipe an USB drive, do the manual install method but do not run the make_bootable script, and make sure the efi folder is named that and not efi-. 

You are a life saver! The manual method did not work on the new USB drive, but I realized that the original USB from the old server was set to boot in legacy mode. The EFI folder was named EFI-. I renamed it to EFI and it now boots like it should. I don't know how I did not catch that before. I knew it had to be something simple. Thanks so much. 

I know this topic is a bit old, but the rename of EFI folder from EFI- to plain EFI totally worked for my Aoostar WTR device and it booted!! AWESOME!! Just a heads up for anyone else migrating to something like this NAS box. Unraid just rules - I've migrated this same install from a Dell R710 server, to a 1U rack mounted server, to now this Aoostar 4 bay NAS and didn't have to touch anything other than the rename mentioned here!

New NAS is now;

Aoostar WTR PRO AMD Ryzen 7 5825u (4bay NAS, added 32g ram), migrated 2-12tb drives and 2-8tb drives to it.