1. Rename the downloaded file update.zip
2. Turn off the shelf
4. Insert the SD card into the tablet
5. Press the volume (vol-) and press power (hold down both keys.
6. Once the power button lights up, release the button but keep flight-supported
7. Releasing flight-when the phrase "recovery booting kernel image" appears on the screen

I add a warning, this ROM erases everything on the shelf.
firmware

yes,but can solved with follow step
1.go to screen menu,sensitivity
2.first set to low,after high