If you see “Invalid SIM” again, repeat the process using the “Factory Reset + Unlock” option in the tool.
Using a tool to switch the device from its normal "Network" mode to a "COM Port" or "Diagnostic" mode. Zte Mf927u Unlock Tool -UPD-
Most devices only allow 5–10 failed attempts before permanently locking the network. If you see “Invalid SIM” again, repeat the
: Switch to a network that has a stronger signal in your specific area. Resale Value If you see “Invalid SIM” again