Armbian 24.5.0 Bookworm images (linux-6.1/linux-6.6) for TVBoxes: Vontar KK MAX / HK1 RBOX R2 / HK1 RBOX R3
(the same dts/dtb should work for these TVBoxes)
Here is a dts and dtb files, working reworked for mainline:
hk1-rbox-r3-profile-kernel-6.1-6.6.zip
(original dts and dtb from TVBox rk-kernel-orig.zip)
Checked the following:
HDMI - works (need to check hot plugging)
HDMI sound - works
USB 2.0 - works
USB 3.0 - works