Mar 7, 2018 - Hi Gian, Thank you for choosing Windows 10 Technical Preview. Error code 31 occurs since the device is not working properly because. If you cannot find the right driver for your device, you can request the driver.We will find it for you. Or, try the automatic option instead. Tech Tip: If you are having trouble finding the right driver update, use the ZTE Modem / ISDN Driver Update Utility.
ZTE MF820D 4G Modem Overview Supporting the same LTE frequencies FDD 800/1800/2600mhz of Huawei E398u-15, this unlocked ZTE MF820D modem is a new multi-mode USB mobile broadband dongle. This LTE modem now on sell at our site is fully unlocked and ready to use with all global services without any contract. It gives you lightning fast Internet connection in LTE FDD network while on the go.