Edimax Technology BR-6204WLg - Manual (Page 86)

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3-2-2 Firmware Upgrade
To upgrade firmware, please make sure you have firmware file ready in your
computer’s hard drive. When you’re ready, enter ‘Upgrade Firmware’ menu to
upload new firmware file to the router.
Click ‘Browse…’ button to select a firmware file to upload. You’ll be prompted
to select the firmware file from computer’s hard disk:
After you selected the file, click ‘Open’. You’ll return to previous menu, click
‘Upload’ now to start uploading firmware file: