If a Cambium 450b needs to be reset there is a specific process that needs to be followed.
How to fix:
Apply power to PSU for at least 10 seconds.
Remove power from the PSU, and then re-apply it as soon as the power indicator light
goes out (about 1 second).
When the unit is in recovery mode, access the web interface by entering the default IP
address 169.254.1.1. The Recovery Image Warning page is displayed.
Review the Boot Selection.
Select "Boot - Default"
Login with the following credentials username= admin password= admin
Then select Configuration > Unit Settings > Set To Factory Defaults followed by "Full Reboot"