Considering that the phone was made for a single market, there's probably not much information about it.
Considering that it's 2-1/2 years old, and can't be updated past Lollipop, you may want to consider getting a new phone.
But ... you have about 8GB to store all your apps, videos, music, pictures, etc. That's not much room. And the manufacturer may have deleted the "yes" choice in factory reset. Try doing the factory reset both in recovery and in Settings. One of them might work. If not, you just have to delete files and/or uninstall apps, until you have more space (restart after any large deletion, like 5 apps or 20 files, just to make sure that the phone becomes aware of the deletions).