teclast x98 3g air after update touch sreen no working

[chong5195]

i guy need ur help.. i has one teclast tablet after update window 8.1 touch sreen not working .. cannot do anything sreen .. how to reset factory .. now only can prees up down and on buttom.. pls help me.. and i try connect usb to use mouse also not working.. no idea guy.. pls help me

[chong5195]

anyone can help.. how to rest or how to go safe mode.. .. or any idiea????