@ebin-dev good idea, I can try that. For the moment I seem to have a stable system running 25.11.2 with the 6.12.58 kernel and the l2-cache and op1-opp patches loaded as kernel overlays. My use case for the Helios64 is as a NAS with OMV8 and ZFS. Who is the maintainer of this board now ? I'm happy to test images on my hardware and it would be good if the latest builds worked out of the gate without having to patch them.

I'm planning on buying said Tv box in order to make it as a klipper host for a 3d printer since pi alternatives are too expensive nowadays.

@Werner The overlay solution worked - thank you ! Is armbian-add-overlay a separate package/command ? I managed to enable it by creating a rockchip-rk3588-usb-host.dts file in the /boot//dtb-7.0.5-edge-rockchip64/rockchip/overlay folder, compiling it to ockchip-rk3588-usb-host.dtbo with the device tree compiler (dtc) and then using armbian-config to enable the loading of the usb-host overlay.

I have just cleaned-up / changed (again) things w.r.t. network names for my Nanopi-R6C. Same as Nanopi-R4S, it has 'wan' and 'lan', where wan is on-chip ethernet and lan is external PCIe connected. Double check for the R4S, but I am almost sure. So a mainline kernel in principle just numbers them eth<x> depending on timing and other things. New kernel behavior is that the on-chip gets named end0 and for my Nanopi-R6C the external gets named enP3p49s0, as that represents how it is HW connected via PCI-e. That is 7.0.<x-flavor> generic distro kernel. Then Armbian has 2 udev rules to rename to wan? and lan?. That is where the problem was and is for me as I use various different bootloader/firmware. I removed those udev rules as I run standard main distros as well and I need the names for bridges and vlans etc future proof and I don't care about names wan and lan (not using it as router). But if you want to keep that naming, check bootloader version (U-Boot I guess for you) and also udev rules and maybe other patches for RK3399 and/or R4S.

@Werner Do you think Armbian Edge with Linux 7.1 is available and works on OrangePI RV2 already? If so I'd love to get that image. As I understand it the SoC's support has been fully mainlined in Linux 7. (By the way request to admin to lift my messaging quota. Will edit this request away in a few hours.) I just checked inside Armbian Imager, and Armbian Edge is not available there - the same two images as are on https://armbian.com/boards/orangepirv2 are in there, that's all.