Hello David, Dave
The AOSLOGO file (PNG 800x600) worked fine here in my UEFI ArcaOS 5.1.
I pushed it a little bit further and resized the file to 1920x1080 with PMView and it also worked on boot.
I don't know if it is a good idea to go with 1920x1080 as default for UEFI PNG boot Logos. What do you think?
Regards