@laibsch Hmmm, the current latest image seems to work OK. On the other hand, I tried to get the serial console working, but I did not manage to do so. I used an FTDI-based cable ( https://ftdichip.com/wp-content/uploads/2020/07/DS_TTL-232R_RPi.pdf ) with the recommended connection diagram, but nothing ever showed up on minicom's output. (It always showed it as Offline, and not even a single byte came through) I tried 9600 and 115200 baud for minicom, and also set `dtoverlay=uart0` in config.txt at some point. But neither helped in any way.

Debian 12 and 13 have trouble establishing the correct EDID for the monitor, which is why it doesn't recognize resolutions correctly. I spent two weeks reading and testing everything until I found the solution. You need to connect the monitor to a Windows PC, install and run the CRU program. This program correctly reads the monitor's EDID. Simply export the data and save it as a BIN file. Then, reconnect the monitor to your Orange Pi device. Copy the exported .bin file to this directory: /lib/firmware/edid/ Next, you need to load the parameters into the kernel: Edit the armbianEnv.txt file and add: extraargs=drm.edid_firmware=HDMI-A-1:edid/you_file.bin video=HDMI-A-1:1024x600@60 Set your chosen resolution. Restart and verify: `cat /proc/cmdline` Check that the string loading your custom EDID appears.

Integrated with bump of uboot and kernel. https://github.com/armbian/build/pull/8873 Test image: https://k-space.ee.armbian.com/incoming/igorpecovnik/ebin/Armbian-unofficial_25.11.0-trunk_Espressobin_trixie_current_6.12.57_minimal.img.xz

Then it is time to follow http://debug.armbian.de

@laibsch Thanks for the suggestion, but I wasn't able to actually get a login prompt, or start up a shell as a result of this problem. (No UI or virtual console was visible or accessible.)