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This document describes another upgrade instruction for Eunhasu which is not able to upgrade by upgrade page. There are 3 ways to upgrade. First, Samba. It is for Windows file sharing protocol. You can access \\eunhasu\mwdata\music in windows file explorer if you used sMS-200. Second, USB memory stick. It is internal debug mode. several conditions should be matched to upgrade. Finally, imageUSB utility. This is external application to write entire image to SD card.
By samba share
Download upgrade-last.tar file from server
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upgrade_server={EUNHASU_IP}/music is possible
By USB
Format USB to FAT32
Change USB label to SOTMDEBUG and it must upper case
Download upgrade-last.tar file from server
Copy downloaded upgrade-last.tar to the USB root directory
Make file named run_debug.txt in the USB
run_debug.txt file must contain following strings
upgrade force
Remove whole inserted USB stick on sMS-200
Insert SOTMDEBUG USB to sMS-200
On working, blinking left LED
After finish, device shows left LED off
By external utility