[Q] ZuBfi d713 (sofware problem)

Model of the tablet: ZuBfi d713

So recently I had DEMO word on my screen so I followed up the thread I found on androidtablets, installed system package and the word is gone... however, I'm unable to change my wallpaper (problem with launcher? it remains as default) and my navigation buttons are gone (back, home etc.).
I tried factory reset and cache wipe - no results.
Has anyone of you spotted this device? I would like to try to flash ROM, but as you can see there is no support or even the site of the producer available, so you are like the last chance to find the right ROM.

Any help appreciated.

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