Standard firmware supports up to 32 simultaneous users over a 2.4GHz Wi-Fi band. How to Update Your ZLT P21 Firmware
That being said, here's a general outline of how a feature request for a firmware could be structured: zlt p21 firmware
If the router lights are on but you cannot access the login page after an update, the IP address might have changed. Standard firmware supports up to 32 simultaneous users
The ZLT P21 is a capable piece of networking hardware, but its longevity depends on proper firmware maintenance. For most users, sticking to the official stock firmware provided by the seller or manufacturer is the safest path to ensure stability and security. zlt p21 firmware