How to Unlock Airtel E1731 (E173Bu-1) Huawei Customised Firmware Modem?
1. Download E1731 (E173Bu-1) firmware update from the link which is provided at the end of the article to update your modem with un-customized firmware.
2. After that, download Universal master code software.
3. Now generate unlock code and flash code using Universal Master code calculator from Huawei tab.
4. Now plug your Airtel E1731 (E173Bu-1) Huawei customized firmware modem to your laptop / PC and disconnect from the internet.
5. Close the default dashboard of the dongle and run firmware update E1731Update_11.126.15.00.00.B416.exe, it will find your modem automatic.
6. Now firmware update process will start and after a few second it will ask you flash code as your password.
7. Provide the flash code as password.
8. After a few seconds, your modem will be updated successfully.
Now update the modem with latest Huawei Mobile Partner Software from this link.
Now after fully updated your dongle, unplug and plug your modem with another than default sim (other than Airtel sim) in your computer / laptop. Now your modem will ask you unlock code. Put the NCK / unlock code which you had generated earlier and your Airtel E1731 (E173Bu-1) Huawei dongle is unlocked forever.
Note : If your modem does not ask for unlock code then use CardLock Unlock tool to write the unlock code into your modem.
Download E1731 (E173Bu-1) Firmware Update (E1731Update_11.126.15.00.00.B416)