How can i update 1.13

Hi everyone
I used WebGUI and select “Start update mode” in the Basic option.
My Mod Dwarf LED showe me “Copy File, eject from computer and unplug from USB B port”
and no any message on this mod dwarf.
What can I do?
I need your help

Have you pasted the file for the new version in the storage device that appeared on your computer?
Take a look at this page. Here you can download any MOD OS version and under you have the instructions on how to do a manual update.