When your ZLT P21 displays "IMEI Null" or "IMEI 0":
Before opening the archive, ensure you have: repair imei zlt p21.7z
However, the technical ease of this process is shadowed by strict legal frameworks. In many jurisdictions, altering an IMEI is a criminal offense designed to deter the use of stolen devices. While restoring an original, lost IMEI to a device you own is generally considered a "repair," changing it to a different number to bypass network blacklists or "spoof" a device type is illegal. It is vital for technicians and hobbyists to ensure they are only restoring the original factory-assigned identity printed on the device's physical label to remain within the bounds of the law. When your ZLT P21 displays "IMEI Null" or
If you bought the router from a provider like Telstra, T-Mobile, or Vodafone, they can remotely push an IMEI repair via OTA (Over-the-Air) configuration. Many users skip this, but it is the safest option. It is vital for technicians and hobbyists to