Installing OpenWrt on UniFi nanoHD

Installing and Using OpenWrt
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Yes, I can help. So once you install 3.9.27 in your device and it reboots, just open your serial console, you will download from there your new sysupgrade image.

Putting it step by step (more or less):

  1. Download the sysupgrade image in the same directory you will be running your HTTP server.
  2. Install a simple HTTP server, I chose Python's SimpleHTTPServer.
  3. Change your LAN IP to something like 192.168.1.66.
  4. Connect your LAN cable to your Unifi Nano HD.
  5. Run your http server python -m SimpleHTTPServer 1313.
  6. Open your serial console and download sysupgrade image using curl.
  7. And, finally use the instructions to flash your sysupgrade using dd.

Let me know if you need more detail.