| Issue | Likely Cause | User Workaround | | :--- | :--- | :--- | | | Memory leak in the 5G protocol stack. | Disable 5G SA in settings; force "LTE only" to test stability. | | Wi-Fi 6 (802.11ax) drops | Incompatibility with specific client chips (Intel AX200). | In Wi-Fi settings, disable "OFDMA" or fall back to Wi-Fi 5 (802.11ac). | | High latency (bufferbloat) | Lack of SQM (Smart Queue Management) in stock firmware. | Place the MC888 in bridge mode and use a third-party router (e.g., OpenWRT) for QoS. | | SMS not receiving | Firmware prioritizes data bearer over SMS storage. | Manually check "SMS Settings" and ensure "Storage" is set to SIM + Device. | The Holy Grail: Third-Party & Custom Firmware Currently, there is no OpenWRT or DD-WRT build for the ZTE MC888. The proprietary nature of the Qualcomm 5G modem (SDX62/SDX65) and the lack of driver source code prevent this.