Looks great. If it's not too much to ask of you, could you take us through the whole procedure?
Cheers!
If you've a Huawei already there isn't really one. Connect to the Huawei's web page, go to the option that shows you the serial number and it allows you to change it.
What you will however achieve if you purchase the same one I have is a cable to convert the incoming fibre from APC to UPC. You'd need an SC fibre flange/coupler and a short single mode fibre cable that's APC on one side and UPC on the other. The UPC bit is why there's a blue connector going into the ONT not a green one. Just how they roll.