Often removes carrier-specific UI bloatware and enables hidden features.
Power the router back on and connect your laptop to its Wi-Fi. Open a browser and go to the router's settings page. A box will appear asking for a "Network Unlock Code" or "NP Code."
DC-Unlocker, QPST Configuration, or specialized ZTE Flasher tools.
The (e.g., Telstra, Orange, Cricket Wireless)
Look at the sticker on the back of the router or log in to the web dashboard (usually 192.168.0.1 ) to find the 15-digit IMEI.