Hi,
I have the same problem. Firmware from mentioned website is only for ZADACOM modems and will not support HUAWEI modems. I contacted people around the project, if there is a possibility to create firmware, that will support this modem, but had negative answer. They did not have that modem, it is quite expensive to get it. Without having the modem physically at their site, they cannot develop the firmware update.
Now, waiting for some developer, who will have the modem and will modify the firmware by loading appropriate usbserial modules, that will support HUAWEI modem.