Hi mates, I have a F6 plus and I want to signal a problem with the software. I’ll never do an update from Teclast official site until the things are clear. As soon as I received my F6 I tried to update windows as usual. Big mistake! The major updates won’t install (error 0xc1900201). I tried to solve the issue working with command prompt and…I discovered that I wasn’t the administrator! Plus I wasn’t be able to activate the antivirus! Plus I wasn’t able to reset my F6 downloading windows but only reinstalling the OS still on the tablet. So finally I overrided this limitation (don’t ask me how!) and now it works like a charm, but only with a reset downloading a new version from Microsoft server. In the end: I think our chinese mates made a dirty trick and still I don’t know either because or how. Keep your eyes open.