Recommend you to use the UUU tool, it's easy to use.
The following download methods can be used to write the Android System Image:
• UUU to download all images to the eMMC/SD card.
• fsl-sdcard-partition.sh to download all images to the SD card.
• fastboot_imx_flashall script to download all images to the eMMC/SD storage.
You can see the 5 Programming Images section in our user guide document.