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

Download Universal Master Code Tool

Card Lock Unlock Tool (Password of zip file :

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


  1. bhai,there was one query modem is huwaei E303C..two days before my modem has got some problem and it was unable to read my sim….and in hurry i downloaded a dashboard and run it and due to which my original setup got removed from my modem….the latest one got installed and my sim was also working on it but even when i was not using my net just on connecting it…it utilises lots of data and it shows speed of 3.8mbps but my data is utilised so frequently that in idle condion also in 1hr it consumes 1.2gb of data…..i tried many thing avaible on internet but nothing helps me even after formating my pc….can u pls suggest me any way to get back my original setup….some setups are available on the internet but all of them consumes lots of data i dont know why…..even nothing is running in background …..i m waiting for ur reply and thanks in advance……

  2. bhai by using Universal Master Code Calculator Final 2013 , when i run the firmware then it says to give code but when i give the flash code it says wrong attempt and u r left with 2 attempts only…..what is the use of unlocking the huawei E303C-1 modem because i can use any sim in it…..pls reply….also why my comment is not shown above

  3. bhai yesterday my huawei E303C-1 modem (hardware version is CH2E303SM )was not responding so i thought to install the software again but i thaught to use the latest one so i downloaded it from different sites and i dont know much about the softwares but it was dasboard …on running it it removes my original files from the modem and intalled the latest one the only or i can say the major problem is that when i connect it , it started giving speed of 1mbps to 3.1 mbps even when nothing is getting downloaded in the background….it consumes about 1.2gb of data in just one hour …..i dont know how to stop it and also i dont know is this any virus or anything else….from ur site i see to unlock the huawei E303C modem …then i downloaded the firmware and universal master code and run it but it is saying the flash code entered is wrong ….pls bhai help me in this regard….I am waiting for ur reply and thanks in advance