Download the necessary files here.
(ATENTION: PUT A MICRO SD ON TABLET TO BACKUP OLD FILES)
1) Unzip the files on a folder

RECOMENDED: ERASE TABLET TO DEFAULT

2) Enable USB debugging on tablet

SETTINGS -> DEVELOPER OPTIONS -> USB DEBUGGING

3)  Execute “turn_original.bat”

4)  AFTER the reboot, execute the step 2 again (re-enable usb debugging), then press ENTER

5) AFTER the LAST reboot, execute the step 2 again (re-enable usb debugging), then press ENTER to execute final operations (backup, clean default applications and install mobilemarket).

6) That’s all folks!  😉