If you are getting any QR Scanning errors during installation, it may be an MDNS issue with your network environment. Please try this
- Kill Firewalla App
- On your phone, go to Airplane mode, wait 10 seconds and come back to wifi. This step will flush all the networking based Cache.
- Unplug Firewalla and wait 10 mins.
- Plug Firewalla back in.
- Wait 5 min for the box to boot up.
- Launch Firewalla App.
- Restart the pairing process.