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Some updates unlock new management features within the HUAWEI AI Life App or Web UI. How to Update Huawei B818-263 Firmware Huawei B818-263 Firmware
If that hidden menu does not work, you need custom firmware. The most popular modded firmware for the B818-263 is based on 11.0.4.15 with the "HC" unlock patch. This adds a full "LTE Band Lock" tab in the Advanced settings. Huawei B818-263 firmware I understand you're looking for
The enthusiast community has created "unlocked" firmware versions (often labeled "Full Band" or "Unlocked WebUI"). How to Update Huawei B818-263 Firmware Huawei B818-263