smp

Thank you for your replies. I already sold the box because I tried pretty much all RK3328 dtbs I could find. I also tried different sdcards just to make sure sdcard is not a problem. I do have a TTL serial adapter but since there is no proper connector on the board I didn't want to solder the wires (my soldering skills are not very good).

I bought A5X Plus (1G/8G) box and I can't get it to boot Linux from an sdcard (I tried Armbian and LibreELEC images). All I get is a red LED. Can anyone help me get this box working? Here are the board photos: