Unfortunately no one can be told what fun_plug is - you have to see it for yourself.
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I want to upgrade the firmware a ZyXEL NSA-220 from version 1.04(AFB.0)C0 to version 2.0.
There are no published instructions on how to do this or no reports that I could find on anyone successfully doing this. There is not even a firmware recovery process that I could find and follow.
Attempts to upgrade via the devices web-page interface all fail with "invalid file" error or similar when trying to upgrade.
I welcome any suggestions.