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: It is highly recommended to perform manual firmware updates while your computer is connected to the router via an Ethernet cable rather than Wi-Fi to prevent connection drops during the process. Never Power Off

This is the easiest method, but carriers rarely push OTA updates for 4G hotspots anymore. update+software+in+zte+mf297d

No. Firmware updates do not SIM-unlock devices. You need an unlock code from your original carrier. In fact, a firmware update may re-lock the device to its original carrier profile. : It is highly recommended to perform manual