Restore for GL-A1300 router

I am attempting to use the firmware provided for the GL-A1300 to restore via uboot. I can successfully reach the uboot restore page, but when attempting to actually restore with the provided images, the uboot restore indicates update failed.

This occurs with both 4.2.1 and 4.2.0. What am I missing ? How do I use the image files to restore the router ?

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