4pda forum (reputable thread), DC-Unlocker paid service (uses official firmware), or Huawei service centers.
I can provide the exact driver links and tools tailored to your setup. Share public link Huawei E173u-1 Unlock Firmware
A quick Google search reveals hundreds of forums hosting "E173u_Unlock.exe" files. Be extremely careful: 4pda forum (reputable thread)
: This is often required if your current firmware version (e.g., version 11.126.15.00.209 DC-Unlocker paid service (uses official firmware)
For most users, and use DC-Unlocker or a reputable code service. Only pursue firmware if your modem is already bricked (recovery flash) or you need debranding beyond simple unlock.
Your modem's current (found in your connection manager diagnostics). The operating system version on your computer.