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You can use SD-Card and make two partitions like "boot & rootfs " copy the images uboot.bin zimage, x.dtb file into boot partition and extract root file system in rootfs partition and insert SD-Card into A5d2x and power-on
please copy your required files to sdcard and insert the sdcard to board.
follow the below commands to copy the files from sdcard to board after booting..
mount /dev/mmcblk1p1 /tmp/
cp /tmp/<file name> /data/ or /mnt/
You can use SD-Card and make two partitions like "boot & rootfs " copy the images uboot.bin zimage, x.dtb file into boot partition and extract root file system in rootfs partition and insert SD-Card into A5d2x and power-on