Hi @Jimmychea,
I hope you are doing well.
One needs to Install and configure a TFTP server on a host computer that is connected to the same network as the i.MX8MPlus LPDDR EVK and copy the required kernel Image and dtb to TFTP_DIRECTORY.
Then write the bootloader (imx-boot*) image to emmc/sd using the below command.
uuu -b emmc bootloader
Power on the board and stop at the uboot cmd line. and run below mentioned commands.
Thanks & Regards,
Dhruvit Vasavada.