It's just as likely the speedtest result is wrong. There have been instances of speeds being reported in excess of the ADSL sync rate, which is impossible.

The Huawei E367 dongle works with the following Billion routers:

1) BiPAC 6200NXL - A broadband wireless router but require firmware version 1.02i.r3.
2) BiPAC 7402X series - A range of ADSL router with USB support. You will require firmware version 6.04b.ds1.