How to boot only through sdcard?

I purchased two 3328-CC boards without emmc modules, because there were no stocks on

online shop. And then, I’m trying to boot only through the sdcard fused in Android.

But, the result is always fail.

When I insert sdcard to tfcard socket and power on, there is no change on the board.

Only green and red led are on just as I pluged usb cable to power up without sdcard.

What is the problem? I just followed the routing the the link below.

ps : bought two boards, and exatly same situation.

The link is missing.

http://en.t-firefly.com/doc/product/info/id/473.html

This works for Win and Linux get https://etcher.io/ download the image. start etcher select image and card hit flash. No need to unzip image or ISO

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