Ok "CST", that's a Chinese fake and is NOT a Samsung, it just looks like one. Which basically means anything that applies specifically to Samsung devices will not work here, such as using Odin for flashing or Samsung Kies. When Samsung builds their firmware, it's always set to show "KST" for Korea Standard Time, "CST" here meaning "China Standard Time"
Knock-off S5, S6, Note4 etc, can very from absolute garbage,
that lies about internal storage and has a really crap camera, to something that's actually reasonable for a Chinese phone, they're very much an unknown quantity and pot luck.
I have to ask, would you know the difference between Korean and Chinese anyway? I do, I live in China.
You've gone into recovery to try and upgrade, but you're only seeing a foreign language and no English, well a real Samsung wouldn't do that. And you wouldn't be able to upgrade using Samsung version Lollipop anyway, because it's not a Samsung.
FYI here's a photo taken with a clone S5, and that's probably about the best this one will do.
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