: You can often find your current firmware version at the bottom of the modem's web login page (typically accessed via 192.168.0.1 192.168.1.1 Factory Reset
ISPs contract Nokia to pre-load specific firmware versions. These versions often lock out advanced settings like Band Locking (locking the modem to specific LTE bands for stability), APN editing, and DNS customization. This is done to reduce support calls; if a user cannot change a setting, they cannot break their connection. fast5366lte-a firmware