This is the serial output when i boot without sd:
GXL:BL1:9ac50e:a1974b;FEAT:ADFC318C;POC:3;RCY:0;EM MC:0;READ:0;CHK:AA;SD:800;USB:8;LOOP:1;EMMC:0;READ :0;CHK:AA;SD:800;USB:8;L
The sd boots fine for example libreelec.
With Amlogic usb burning tool when i try to flash an img i get
[0x30405004]UBOOT/Partition boot/Verify patition/Error & one time that i passed it somehow i got [0x30404004]UBOOT/Partition boot/Verify patition/Error.
With burn card maker i burned update_MINIM8SII_rv112_megabox_20170320.img and when i boot from sd i get this log: