This is another known issue. A user on the Orange Poland forum reported that after an update, their ZTE MC888 lost support for the 5G N28 (700MHz) band, a crucial band for their area. In some cases, the band might still be selectable in a "hidden" debug menu but not officially supported.
Open a web browser and type 192.168.0.1 into the address bar. Enter your administrator password. Step 3: Check for Updates Navigate to or System Management . Click on Update or Firmware Upgrade . Zte Mc888 Firmware
New firmware releases patch critical vulnerabilities, protecting your local network from external threats. This is another known issue