I’ve just put mine in the bin. Literally, picked it up and dumped it.
Yesterday I watched, before my eyes, the Realtek soundcard ‘disappear’ from the devices list (noted by Zoiper). I stripped the back cover off, grabbed a magnifying glass and found an actual crater in the Realtek chip. These Teclast machines are built with either really bad grade or pre-used components. Disaster waiting to happen, just get rid and buy something decent.