Huawei B310s-518 Firmware Guide

Once you flash an unlocked firmware, you can access the hidden engineering menu:

The clicking was coming from the SIM card slot. huawei b310s-518 firmware

If you need to flash a specific "Universal" or "Global" firmware (often to remove carrier bloatware or unlock SIM slots): Once you flash an unlocked firmware, you can

In some firmware versions, you can manually select the LTE frequency band to stabilize connection speeds. Once you flash an unlocked firmware