Comtrend Corporation Wireless-N Broadband Router User Manual page 160

Click the 'Browse' button first; you'll be prompted to provide the
filename of firmware upgrade file. Download the latest firmware file
from our website, and use it to upgrade your router.
After a firmware upgrade file is selected, click the 'Apply' button, and
the router will start the firmware upgrade procedure automatically. The
procedure may take several minutes, please be patient.
NOTE: Never interrupt the upgrade procedure by closing the web browser
or physically disconnect your computer from the router. If the firmware you
uploaded is corrupt, the firmware upgrade will fail, and you may have to
return this router to the dealer of purchase to ask for help.
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