Updade: i tried to flash to memory using a male to male USB "Bus 003 Device 008: ID 1f3a:efe8 Allwinner Technology sunxi SoC OTG connector in FEL/flashing mode" Needless to say, i've been duped, scammed, fooled perhaps. I found a picture of a model exactly the same as that one, and it had a H3 chip, since from what i see Rockchip is best supported by the comunity, i'll give up on this board. Tomorrow i'll do one last update when the USB-TTL arrives, to see if my suspicions are confirmed.

Can you get an orange pi zero 3? As a hardware beginner, you need a very stable, well known linux board.

Sorry, I've never done anything like this before. I tried setting it up according to instructions in various GitHub threads, but it always failed. You're the only person who helps me with advice, and thanks to you, I've only been able to build an image with the required kernel module. I haven't achieved anything else, except for the white screen.

See build log https://paste.armbian.de/lesoquheja The kernel works, but installing the .deb failed because my extlinux script could not copy: /usr/lib/linux-image-6.18.1-edge-sunxi/overlay/sun8i-h3-analog-codec.dtbo The whole overlay folder does not exist. It does exist for 6.12.58-current-sunxi and last time I compiled kernel for the nanopineo was 6.16.8, the overlays were created. I remember it was also once the case with edge kernel for other SBC ( .deb package from the Armbian beta repo). That time own local build did create overlays. I am not sure where to look or what could be wrong.

Alright Did you ever make this LCD work with your H618 motherboard, with another kernel driver?