Which firmware to use?

It's my first time updating an android phone. To be specific, I have a Samsung Galaxy S4 manufactured by DoCoMo which I'd like to update from 4.2.2 to 5.x (Lollipop).

Here's a screenshot of my device information: i.imgur.com/xawKmqB.jpg

I've seen a firmware named Samsung Galaxy S4 Canada SGH-I337M (mrcrab.net/view-stockrom/sgh-i337m.html), but I am not sure if this is the firmware for my phone. Is it? I'm not sure which firmware to use. And also, is there any way to confirm my device name?

Thanks

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