It seems that micro sd slot doesn't work it doesn't see any sd card! I tried with some micro SD cards. Is there a way to boot box using a USB stick inserted in a USB port?
I'm only aware of the phoenixsuit that can boot the box from a pc via usb by cable.
Or if you have a kernel in EMMC or SPI that can boot anything else from usb or wherever.
Usually if Allwinner SOCs are presented with an SD that will always take priority to boot. Can you see a fat formatted SD from Android?