I have a Beelink GT1 (not Ultimate) with 2GB RAM and 16GB storage. I tried installing the 5.77 build but can't seem to get to the desktop (I've tried many of the DTBs to no avail). On CoreElec I use gxm_q201_2g.dtb but that file itself caused issues. Has anyone gotten Beelink GT1 to work? All of the posts I searched from Beelink GT1 users are from several years ago.