Usually the unit will delete zip files once they are extracted on the unit, if you don't know what they are leave them for now.

Maybe choice of locale isn't offered initially with TWN fw, i can't recall but that would be unusual. However it should definitely be offered on hard reset, did you do that?

I'll check on the dictionary and get back however i think you might be only able to use Chinese. My ES is so bad that the Mexicans would think i'm talking Chinese and/or Greek anyway, but stand by.