Download the following file:
Insert you IMEI1 and choose "HUAWEI Y300-0000" as model.
Copy the product ID.
On the following picture it is in german, but on the page it is described in english which information you have to enter.
Enter the information on following page: http://emui.huawei.com/en/plugin.php...ock&mod=detail
You have to login via Facebook to get the code and it only works with facebook.
Every Facebook account can unlock two devices every six months.
You will get the unlock code marked red.