Find LiveSuite, find an official image for your teclast and flash the image. Use google to find all this :-)

Hello to all, sorry for my english, italian are. my P85 , power on, will not start android, remains on the screen in china, after writing TECLAST. I have pressed the reset button, but does not...

Its sounbds like a no-name device, so your best best is to track down the seller or supplier for this device. Many cheap devices like this one will never get any updates.