(In reply to Andreas Schwab from comment #5) > You should not use the preinstalled u-boot, but the one from the image. Did so; copied the JeOS image (2022.03.18-Build26.5) to an SD card. U-Boot was not detected and the machine didn't even start to boot (ie no output on the serial console, LEDs not changing, etc.) Bit of a loss on what to do next.