How to restart and enter uboot mode without serial cable to reflash system image from TFTP server?

Dear friends,

We are producing the embedded IOT products without GUI based on Colibri_imx6dl SOM in manufacturer. We are exposing ethernet and usb2.0 ports to external world. I don’t want to expose serial cable.

IN this setup without serial cable, how can I reflash system image from tftp server in manufacturer and after it’s deployed?

Do you have any suggestion?

Much appreciated!

Please have a look at the answer to the following question.