I did order the dfrobot carrier board and a cm4 with 8gb on-board storage. The precompiled v21.03.2 file of the dfrobot product page works. However, I am not able to flash anything newer than that.
I did compile v24.10.0 (as well as v24.10.1) making sure i install the packages mentioned in this guide https://viniciuspaes.com/raspberry-pi/how-to-build-custom-openwrt-image-raspberry-pi-router/ (instead of userland i use the bcm27xx-utils package).
However, after flashing them, I only get a signal from the eth port for a few seconds and it turns off. The act led flashes 3 times in the beginning remains on for 1 or 2 seconds and then flashes irregularly and very dim until it turns off.
The same problem happens if i use the precompiled v22 and v23 files mentioned in the guide, as well as the v24 version for a cm4 from the openwrt image builder.
If the precompiled v21 was not working I would simply assume i got faulty hardware.
I did buy a usb to ttl converter and attached it first according to the documentation on the dfrobot page and then like in jeff gerlings guide on how to attach to a cm4 using uart but cannot get any signal whatsoever.
What would you try in my place?