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Ubiquiti - CLI - Downgrade Firmware

SSH into the device.

ssh ubnt@192.168.1.10

Determine the firmware to download from https://www.ui.com/download/unifi/.

Confirm it is a .bin firmware file.

cd /tmp
wget https://dl.ui.com/unifi/firmware/U7PG2/4.0.80.10875/BZ.qca956x.v4.0.80.10875.200111.2335.bin

cp BZ.qca956x.v4.0.80.10875.200111.2335.bin fwupdate.bin

upgrade <url> 
upgradesyswrapper.sh upgrade2 &

/var/logs/messages