Sometimes a firmware update changes the default Wi-Fi password or resets the SSID name. Look at the bottom sticker of the device for the original credentials, or connect via Ethernet cable to reconfigure the wireless settings.
With the right build, absolutely. It outperforms consumer MiFi devices (like the Nighthawk M1) in antenna options and outperforms cheap travel routers (like the TP-Link MR系列) in raw LTE speed. huawei b311221 firmware portable