Huawei has launched E303 model in various countries, some are directly unlock-able using only Unbranded Huawei mobile partner software, as i have unlocked Hutch E303 modem. I mean to say that Huawei has launched E303 modem somewhere with uncustomized firmware and on some places customised firmware. Un-customised firmware Huawei E303 modems can be unlocked directly using unlock code and unlocking tool.
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 Hi-Link modem can not be unlocked through normal procedure.
 
For unlocking Huawei E303 customised firmware modem you need to first flash the modem with uncustomised firmware and then you can follow the normal procedure which is available step by step below.
 

How to flash Huawei E303 customised 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 21.157.31.00.850)
Note : Huawei hilink firmware starts from 22, don’t try in normal modem.