Upgrade Huawei E303 Firmware to to unlock all Huawei E303 Modems – Huawei has launched E303  model in various countries, some are directly unlock-able using only Unbranded Huawei mobile partner software, like you can see in this article (Hutch E303 modem unlock solution). I mean to say that Huawei has launched E303 modem somewhere with un-customized firmware and on some places customized firmware. Un-customized firmware can be unlocked directly as you seen in this article also.
huawei e303 modem
huawei e303 modem
But, if your Huawei E303 modem comes with customized firmware then   above mentioned link solution will not work for your modem, and your Huawei E303 modem can not be unlocked through normal procedure.
For unlocking Huawei E303 customized firmware modem you need to first flash the modem with un-customized firmware and then you can follow the normal procedure which is available step by step below.
Step by step guide to flash Huawei E303 customized firmware :
  1. Download all the software / firmware from the link which is provided at the end of the article. 
  2. Now run Universal Master code software, select Huawei tab and generate flash code for your modem.
  3. Now run the download firmware file of Huawei E303 modem and when ask for password / flash code then provide the flash code (which you generated earlier) as your password.
  4. Now wait for finish the flash process.
  5. Now Close any runing software / dashboard / connection manager.
  6. Run the CardLock_Unlock software / tool.
  7. Now put your 8 digit unlock code into the unlock code box and click on OK.
  8. Now you will get message “Unlock Success”.


Note : Don’t enter any wrong unlock codes into your Huawei E303 modem, it is a new security code modem and contact on email kamlesh2011@gmail.com to get unlock code in cheap rates only 1.50$.

(Firmware Version
Card Lock Unlock Tool (Password of zip file : modemunlocksolution.blogspot.com)
Note : Huawei Hilink modem firmware starts from 22, don’t try at normal Huawei modem.


  1. dea 3G Net Setter :-

    Unlock code 63752411

    Flash Code 44751075

    IMEI 860369012405542

    Firmware Version

    Not able to unlock solve problem….

  2. I have a huwaei modem with the following details from DC-Unlocker. I followed the procedure u gave above and it shows me this error msg when am trying to perform the first stage (update firmware): “Error code:17, The wireless terminal inserted is not Firmware, Update Wizard Can’t continue.”

    Found modem : E303

    Model : _Unknown Huawei modem_

    IMEI : 861195003150725

    Firmware :

    Dashboard version : UTPS23.

    Serial NR. : X7SBYA9332809183

    Voice feature : enabled

    SIM Lock status : unlocked

    Wrong codes entered : 10 (unlock attempts left : 0)

  3. Hi Kamlesh Kumar, this page is awesome, but I have a problem: A few days ago I upgraded my modem “Huawei E303” to the version “” and from this day ceased to accept SIM cards, saying “Only the specified SIM / USIM card can be used on the device.” I ask your help please, I’m from Cameroon… !!!

  4. plz help my airtel 4g E3372h-607 uppdate WEBUI_17.
    firmware now cant upgrade E3372h-607_Update_21. error code 13 plz help