You should look for the latest Mobile Partner Software and Drivers from the official Huawei Download Center. Versions like 4.25.45.00 are known to work for similar Huawei models on Lion and newer systems.
While the modem is a legacy product, you can check the Huawei Support Global page for updated "Mobile Partner" dashboards that include Mac-compatible drivers. driver huawei e173 modem for mac osx lion 10.7.4
In 2011-2012, Huawei distributed a macOS application called (version 21 or 23) bundled with a .kext driver for Snow Leopard. It sometimes works on Lion 10.7.4 if SIP is not an issue (SIP didn't exist until El Capitan, so you're safe). You should look for the latest Mobile Partner