I had previously written article about unlocking of Airtel E1731 (E173Bu-1) Huawei Customised Firmware version 11.126.16.04.284 Modem Dongle free. In Aug 13 2012 19:28:09 Airtel with help of Huawei launched another firmware modem version 11.126.29.00.284 of Qualcomm MSM6290 Chipset. Today, I will guide you to unlock Airtel E1731 (E173Bu-1) Huawei Customised Firmware Modem Dongle Free.

How to unlock Airtel E1731 (E173Bu-1) Huawei Customised Firmware Modem Dongle Free :

 

1. Download E1731 (E173Bu-1) Un-customized Firmware Update.

2. Now Download Universal master code software to generate the unlock code and flash code for your Airtel E1731 (E173Bu-1) Huawei dongle.

3. Now generate unlock code and flash code using Universal Master code Calculator.
universal master code by darmis
universal master code by darmis
4. Now plug your Airtel E1731 (E173Bu-1) Huawei Customised Firmware Modem Dongle to your laptop / Desktop or disconnect from internet if already plugged.
5. Now close the default dashboard of modem / dongle and Run E1731Update_11.126.15.00.00.B416.exe,  it will find your modem automatic.
Searching for Airtel Huawei Device
6. Now firmware update process will start and on the next screen you will be asked to give flash code as your password.
 
7. 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 dongle / modem will ask you unlock code / password. Put the password which you had generated earlier and your  Airtel E1731 (E173Bu-1) Huawei Customised Firmware Modem Dongle is unlocked forever. 
 
Update : If above mentioned firmware download link does not work then download this firmware (Firmware Version is E1731Update_11.126.15.00.00.B416).

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