Hi, I think I am having a similar problem as you.
Have you tried to reinstall the system?
Currently the official firmware is only available from the Chinese Official Website.
And the instructions are only in Chinese.
http://www.teclast.com/tools/pad/showtools.php
http://pan.baidu.com/s/1milJGJe
If you do not understand Chinese, it can be extremely difficult to follow, I suggest returning the item and ask for a replacement if you can.
If you want to give the re-installation a try, I can try to upload the firmware and translate the instruction for you later this week.
When I am attempting the installation for my Tbook10, I ran into the following problem.
http://techtablets.com/forum/topic/teclast-tbook-10-android-installation-failure/