I got a F7D3302 v1 with ddwrt last week and tried to update to openwrt and stuggled a whole day
I found notes, that the F7D3302 all the time should be installed by tftp or the easiest way with CFE Bootloader Webserver
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Download the image, you want to flash and set your Computer's IP Address to a static IP of 192.168.2.8.
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Make a factory reset + ensure to unplug any USB or Ethernet cables from the router before performing the following.
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Perform a Hard Reset (aka 30/30/30 reset). With the unit powered on, press and hold the reset button on back of unit for 30 seconds; Without releasing the reset button, unplug the unit and hold reset for another 30 seconds; Plug the unit back in STILL holding the reset button a final 30 seconds
the front light may light up or not at all
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Connect the Router to your computer using an Ethernet cable.
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Open the browser and go to 192.168.2.1.
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The CFE page will display and prompt you to choose your firmware file.
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Choose your firmware file and hit Upgrade and wait for at least 5 minutes
kultex