Like ZTE and Micromax, Huawei is also a leading brand of modems. Many Network providers are using Huawei modems to provide the customers. After Idea, Vodafone,  and Aircel, now Bharti Airtel has also come with E1731 that has customized firmware and its firmware version number is and software version is Fakiro . When you will open the cover and see inside, E173Bu-1 will be written and it comes with customized firmware. But, the problem is that it is locked and can not be used with other network provider sim. I will guide you to unlock your new Airtel E1731 with the help of the firmware update.
Universal master code calculator
Universal master code calculator

How to unlock  Airtel Huawei E1731 (E173bu-1) Customized Firmware Modem Free?

1. Download Universal Master Code calculator software and firmware upgrade of E1731 (E173Bu-1) dongle from the link which is provided at the end of the article.

2. Now run Universal master code tool and generate unlock code and flash code of your IMEI.

3. Plug your device to your PC / laptop and let it launch the software of modem.

4. Now close the running software / Huawei mobile partner and run firmware update E173Update_11.

5. It will find your modem automatically.

6. Click Next and when it ask you for password put flash code which you had generated earlier.

7. After a few seconds your modem will be updated with unlocked firmware.

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 will ask you unlock code / NCK. Put the unlock code as password which you had generated earlier and your Airtel E1731 (E173Bu-1) Huawei data card is unlocked forever.

Download E173Bu-1 Unlocked Firmware

Universal master code to generate unlock code and flash code

Update : If above mentioned firmware does not ask for password or unlock code the you download this firmware (Firmware Version is E1731Update_11. It will work 100% for you.


  1. Hi kamalesh.
    My huwae E1731 imei is 354369048255153. I am also facing problem after unlocking. still not able to use any other sim cards. getting “only specifies sim/usim card can be used on the device!”. Can you pelase help what can be done to use a bsnl sim card?

  2. sir i can not upgrade while upgrading every time a error box appeared says upgrade failed. help me
    my .imei is 868510011279410 i have flash code which is 62507087

  3. Both is not Working

    Current firmware version :
    Current Software version :

    Imei:- 354369049524623

    Any Other firmware Avilable

  4. Sir i want to activate voice feature on my airtel E173Bu-1 Its already unlocked can u please suggest me the huawei tool for this regards,
    Vaibhav Ghodke

  5. my airtel dongle e173bu-1 and imei number 350123009876543 please give me unlocking code
    and universal master code is not work.

  6. How to unlock E173Bu-1 | E1731 | EMEI : 8685XX | Firmware Ver. :
    Unable to unlock from any available version says Update Failue, DU Unlocker # code says +CME Operation not allowed, reset counter not working.Nokia Suite Trick also not working, is there any way to unlock.

  7. hello, huawei airtel 3g dongle model e3531s-1 with o unlock attempts left tried unlocking with dcunlocker but failing to do so. upon further pursuing the matter with their onlinehelp assistants, i was told that the customized firmware was not supported. kindly help
    imei 862454028936389
    nck code/unlock code 41522951
    flash code 62922825

    Model No. : e3531s-1
    IMEI : 862454028936389
    NEW ALGO HASH RESET : 4412daacb0e76227bfa1e38d7b150f4f
    OLD ALGO HASH RESET : e26fe5266e706c1c7eea372b08bb8aee
    FLASH CODE : 62922825

  8. Airtel Dongle –
    Model E173Bu-1
    IMEI – 8685****
    Already generated Flash Code and new algo code using Universal code calculator
    Firmware version –

    When I am using the update tool given on this link it says Update Failure.
    Initally it was showing me Target Version :-

    please tell me how to solve this issue and also if i need to download the new firmware then provide the link.
    Thanks in advance.

  9. Hi sir,
    Awesome my device E1731 working fine with unlock. Thank you.

    Can you provide the links to unlock jiofi 4g device. It will be more helpful. Thank you.


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