To know the firmware version of Huawei MiFi routers is very interesting. It is written as software version not firmware version and most of us gets confused.
1. Switch on the router and connect to PC with WiFi or USB cable.
2. Browse its default IP address.
3. Go to Settings > System > Device information.
Here in my case we are trying to check the firmware version of my E5573 router. It is running firmware version 21.180.17.00.983 and WebUI version 17.100.08.01.983, which is of Hong Kong operator.