: Obtain the compressed file (often a .zip or .rar containing the .bin ) from a community source like MediaFire.
The .bin file specifically acts as a modified configuration backup. When uploaded to the router’s management interface, it bypasses factory restrictions to grant and unlock the SIM slot for universal carrier use. How to Use the Unlock File Download File unlock-ZLT-P21.bin
via LAN or Wi-Fi. Log in to the web-based management page (typically 192.168.254.254 or 192.168.8.1 ). : Obtain the compressed file (often a
The file is a configuration or firmware file used to "openline" (unlock) the Zhi Ling Tong (ZLT) P21 4G LTE router How to Use the Unlock File via LAN or Wi-Fi
: Connect your computer or phone to the
: Some versions can be unlocked without files using a "14-14-14 seconds" reset trick performed on the physical reset button.