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.