According to the Beelink developers the GT1-Ultimate shipped with a Broadcom WiFi module, while the earlier GT1 (non-ultimate, but looks identical) box shipped with a QCA9377 module. So either you have a non-ultimate box, or a fake Ultimate box (there are fakes around).
https://chewitt.libreelec.tv/testing/LibreELEC-AMLGX.arm-10.95.0-box.img.gz
^ This image includes a "meson-gxm-gt1.dtb" which should work with QCA9377 modules. I've been waiting for someone to show up and test it. So please install, SSH into the box, and share the URL generated by "pastekodi" so I can see the boot log. If WiFi and BT are working I will send the device-tree upstream to the kernel. If they aren't .. we can see the errors.