Beware of scam sites charging $20 for free firmware. Trusted sources include:
: Take out the SIM card and MicroSD card from the modem before plugging it in.
Flashing firmware carries inherent risks. If the process is interrupted, you can permanently damage ("brick") the modem. Ensure you complete this checklist before proceeding:
while the progress bar moves. Your computer screen may flicker, or the USB disconnect sound may play. This is normal. Huawei E173u-1 Unlock Firmware
Download the official or generic E173u-1 firmware (e.g., version 11.126.85.00.209 or similar). Run the .exe file as an Administrator.
The wizard will search for your device on the COM ports. Once found, it will display the current firmware version and the target version. Click .
: The calculator utility generated an incorrect hash, or you used the Unlock code instead of the Flash code. Beware of scam sites charging $20 for free firmware
: Always flash using a laptop with a fully charged battery to guard against sudden power cuts.
Connect the modem to your PC, close all connection software, and run the .exe file as an administrator.
: Install the official Huawei handset drivers so your PC can recognize the modem in download mode. If the process is interrupted, you can permanently
Before proceeding, verify your device. Connect it to a PC, open Device Manager (Windows), and look under "Modems" or "Ports". If you see "Huawei E173u-1" with no carrier suffix, you are half-way there.
Write down the generated (do not confuse this with the Unlock/NCK code). Step 4: Run the Firmware Update tool Insert the modem into your PC without any SIM card inside.