Edimax Technology PS-1206MFG - Manual (Page 88)

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8.5.2 Upgrade Firmware
You can upgrade new firmware for this MFP Server in this page. Click
“Browse” to select the new firmware in your storage and then click “OK”, the
firmware will be updated in several minutes.
Be aware that if you have started upgrading firmware, you have to follow all
the upgrading steps or the MFP Server can’t turn back to normal
configuration.