Try running through these, renaming them as necessary for whatever OS you know for sure will work on your model.
https://github.com/AeolusUX/R36S-DTB/tree/main/R36S
Hi.
I got an R36S, but the microSD card was dead.
I'm trying to flash a new card, but I can't find a DTB file compatible with my screen.
I've tried several systems; with ArkOS and ArkOS4Clone, the screen stays black, although a faint backlight...