@GmP oook, so now I understand the differences between the two dtso files provided here and in the other thread. Do you spot other differences or peculiarities? Things that are useful are: * the gpio led (do the separate red/blue/green led blinks on both boards?) * wifi reset gpio (do wifi get detected in both boards with base configuration?) * is there a separate PMIC like rk805/rk808 on any of the boards? Things like these go into the dtso for full board support. The PMIC is very important since missing that could cause stability issues.

I followed the "mesa route" without any kind of problem. I cannot following the "libMail route" due to my window manager choice: I installed the Armbian Ubuntu Noble version, but I'm running X Window (not Wayland) in order to get the remote display of the Orange PI Plus running on a local monitor; I tried to do this using Wayland without success. I'im running lightdm and xfce4 now. So the /dev/mail0 is still useful or the mesa-vulkan-drivers are enough ? I read some documentation about the hardware acceleration but in my opinion it is too contradictory. But it is always possible that I'haven't understand anything.....

@jock, sorry for the confusion actually there are two boards (two different TV-BOX) one (here in this post) is an rk3318-H50 as you say T98... using FD650, the other one is rk3318-T9 (only T9) using FD655. All the dtso files posted are correct: for the H50 (T98) in this post you have the versions for the old kernel and the new one. Same in the other post "HELP WANTED" for the other TV BOX. At the end the two latest dtso are valid for the latest kernel. One of the difference between FD650 and FD655 is that the first one has 4 digits but 8 segments (0-7) on the contrary FD655 drives 5 digits and 7 segments (0..6). DTSO files are configured accordingly and fully working. Hope it clarifies.

After wanting to use Debian 13 (Trixie) @Nick A suggested trying to build it myself, and this was my first experience building an Armbian image. I encountered some obstacles, but I got through them. I saw that the model was mentioned branch v20251014. I tried building it (Mate Desktop), which as build smoother than (v20250306) before. I tried booting it with this box (Transpeed 8K618-T) and and found that the wifi was not visible. I followed the troubleshooting methods in the previous thread solved it. I have installed additional IR remote and OpenVFD. Now everything is smooth and happy. The only thing left is the video acceleration, but that would be difficult because it is beyond my ability. Finally, thank you, @Nick A

Even though current is an LTS kernel it probably makes more sense to focus on vendor an edge. vendor because its rockchip bsp and close to being feature-complete. And edge for likely becoming the next LTS kernel which ultimately become current at some point. You can try to see what actually works on current at this time. You can ignore 6.15-6.17 since those patches, if still present, are for archival purposes only and will be remove at some point. In theory it could be re-used but may introduce confusion. If in doubt, copy and rename. Edit: Seems like lots of stuff has been mainlined already. So I suggest shifting your primary focus on edge.