ARM Electronics MP13DVPDN - Manual (Page 55)

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NOTE:
Do not change the upgrade file name, or the system will fail to
find the file.
Step 2: Pull down the upgrade binary file list and select the file you want to
upgrade; in this case, select “userland.jffs2.”
Step 3:
Press “Upgrade”. The system will first check whether the upgrade file
exists or not, and then begin to upload the upgrade file. Subsequently,
the upgrade status bar will display on the page. When it runs to 100%,
the upgrade process is finished.