2.Go to setting->about device->update system to update.
3.After finished, update SPI for 2.2(0907 version), .
4.Copy the 2.2 SPI file to SD card, and change the name to update.img, press the button on the side of the box, andplug in power adapter at them same time, hold seconds, you will see updatefailed screen, then plug into SD card and use remote control to choose updateapply->SD card->update.img. after finished, it will go to updatefailed screen again,
5.download and change the firmware name to update.zip from the followinglink for android2.2, other 2.2 firmware version also is ok.
the same update steps as SPI. After finished, it will stop at upgradingscreen, press enter or ok button to choose the first option" reboot systemnow"
6.Finished.
7.Go to setting->about device to check firmware version.[FONT="][/FONT]
Uboot version is 20110906, recovery number is 20110907, build number is your firmware version.
If you want to upgrade to 2.3 again, just update 20111102 SPI and firmware again.