If it has static IP set follow this to go back to DHCP.
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power on device.
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unplug wired LAN cable from device.
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wait over 15 minutes.
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plug wired LAN cable again.
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rebooting device
If this does not work re-burn the SD card and you are back to standard settings.
Most of this is in the Eunhasu manual.
http://docs.sotm-audio.com/doku.php?id=en:eunhasu:start#system_setup