Hello People, I have successfully upgrade my teclast tpad p81hd from android 2.3 to the latest android 4.01 firmware. The latest android 4.01 able to run and install but the problems are: 1) unable to turn on the wifi -> wifi driver problem? 2) unable to turn on the Bluetooth -> Bluetooth driver problem? 3) unable to use camera I heard there was a bug in android 4.01 related to SIM card region issue which can cause other devices to be malfunctional . This problem can be solve if I have root access or rooted my ICS or firmware. But currently, my firmware do not have root... therefore are there any solution to my problem? Thanks