Default [Q] W17 Pro V3 (QUAD CORE) - Latest Firmwares, Rooting, & Custom ROMS

I just bought Ramos W17 Pro V3.0
Of course it came with its stock firmware/rom of 8gb internal memory.
Looking at their site, it says that my tablet has 16gb of memory, but an update to the firmware is needed.
I can't seem to find an English firmware (if there's any), from the English version of their site.
The only thing I did found is the latest firmware at its Chinese (Main) Site, to which the firmware is Chinese.
My questions are:
*Is it fine to use the chinese firmware, given it's the lastest?
**The unit is brand new (only opened infront of me) yet I saw the SuperUser app when I checked the unit, which implies the unit is already rooted:
*If i would upgrade the firmware, will I need to root it again?
*Where can i find the firmwares?
*Are there Custom Roms already for my Tablet?
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Thanks in Advance.