Huawei has launched E303 modem in various countries, some are directly unlockable using the unbranded Huawei mobile partner 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 with 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 the above-mentioned solution will not work for you, and your Huawei E303 modem can not be unlocked.
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.

How to change the firmware of Huawei E303 customized modem?

1. Download all the software and firmware from the link which is provided at the end of the article.

2. Now run Universal Master code software, go to Huawei tab and generate flash code according to the IMEI for your modem.

3. Now run the download firmware file of Huawei E303 modem and when it asks for password then provide the flash code (which you generated earlier).

4. Now wait for Finish.

5. Now, close the software, dashboard or connection manager, if it opens automatically.

6. Run the CardLock_Unlock tool.

7. Now put your 8-digit unlock code into the unlock code box and click on OK.

8. Now you will get a message “Unlock Success”.

Note : Don’t enter any wrong unlock codes into your Huawei E303 modem, it has a new security. Comment below to get the unlock code.

Download Huawei E303 Firmware Upgrade

(Firmware Version 21.157.31.00.850)

Download Universal Master Code Tool

Card Lock Unlock Tool (Password of zip file : modemunlocksolution.blogspot.com)

Note : Huawei Hilink modem firmware starts from 22, don’t try the above-mentioned firmware in normal Huawei dongle.

81 COMMENTS

  1. dea 3G Net Setter :-

    Unlock code 63752411

    Flash Code 44751075

    IMEI 860369012405542

    Firmware Version 21.157.71.02.356

    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 : 11.126.29.00.251

    Dashboard version : UTPS23.001.07.04.910_MAC23.001.07.04.910

    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 “11.126.29.00.251” 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_17.100.09.00.379
    firmware now cant upgrade E3372h-607_Update_21.200.07.00.00 error code 13 plz help

  5. AYUDA CON MI MODEM 0 INTENTOS

    Found modem : E303
    Model : Huawei E303
    IMEI : 862567020409590
    Serial NR. : X9UBY14415009162
    Firmware : 22.318.24.00.00
    Compile date / time : Dec 25 2013 17:46:08
    Hardware ver. : CH1E3531SM
    Dashboard version : HiLink12.012.02.00.03
    SIM Lock status : unlocked
    Wrong codes entered : 10 (unlock attempts left : 0)

  6. just followed the above instruction now i need unlock code for my device

    Modem : E303S
    Model : Huawei E303
    IMEI : 868988010785035
    Serial NR. : U9CBYA92B1622315
    Firmware : 21.157.31.00.850
    Compile date / time : Mar 28 2012 09:45:01
    Hardware ver. : CH2E303SMIMEI: 868988010785035

  7. hi admin pleas i will like you to help me unlock my modem HUAWEI E303 here are the details
    – Manufacturer: huawei
    – Model : E303
    – Revision : 21.157.22.00.251
    – Phone IMEI : 861862005783288

  8. Hello good morning my name is Mike and am fro Ghana..When i insert a different network sim into the MTN E303 modem, it says : Only the specified SIM/USIM card can be used on the device..Any Help please

  9. Hi frnds, I jst unlocked my Huawei E303 modem with imei..8676480105579140 following the steps above. Now I nid unlock code. Pls kindly hlp me wit the unlock code. I av only one attempt left. Thanks in anticipation.

  10. It’s a pity, now I av no attempt left. Any SOLuTION to dt pls.
    Device name: E303 TO E303S
    IMEI: 867648010579140
    Firmware Versn: 21.157.31.00.850
    Software ver: 23.015.02.00.03
    Serial number: U9CBYA9270926001

  11. Found modem : E303B
    Model : Huawei E303
    IMEI : 860530011078834
    Serial NR. : X3VBYA93B2922400
    Firmware : 21.158.73.00.221
    Compile date / time : Mar 26 2013 14:06:51
    Hardware ver. : CH2E303SM
    Dashboard version : UTPS23.001.07.04.910_MAC23.001.07.04.910
    Chipset : HiSilicon
    Voice feature : disabled
    SIM Lock status : unlocked
    Wrong codes entered : 0 (unlock attempts left : 10)

  12. H
    i Bro,pls i unlock code for my Huawei E303
    IMEI NUMBER – 867648010066577
    FIRMWARE VERSION- 21.157.31.00.864
    HARDWARE VERSION- CH2E303SM

  13. sir, I have telenor new huawei E8372h-608 device when i try to downgrade it gives me error code 17 please tell me how i can fix it

  14. Found Phone, Phone Info:
    – Manufacturer :huawei
    – Model :E303
    – Revision :21.158.13.00.864
    – Phone IMEI :866452015685361

    Tried the unlock Code: 85741045 which is not working :(. Its just leaving an Error.

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