Last year Barbara got an android tablet for her birthday: a Cube U30GT-H. Yesterday it wouldn’t start up properly. It doesn’t have a reset button (or hole) so I decided to update the firmware. I used the method here: http://www.slatedroid.com/topic/33528-firmware-upgrade-instructions/ which is clear and in English.
It is a good idea to use a good-quality USB cable instead of that supplied with the Cube, and use a rear usb port on the PC rather than a front port. The cable from Conrad’s LG phone fits. Apparently the flashing process in very finicky so the physical connection needs to be perfect.
Firstly I used the latest stock ROM from Cube, V1.11 (U30GT-H_V1.11_20121229.zip), which is available from here: http://www.51cube.com/ch/DownShow.asp?ID=127 and used the instructions above. It worked fine but had too many Chinese apps which cannot be removed.
Encouraged by my success I decided to try a cleaned, rooted ROM from here http://www.slatedroid.com/topic/43132-new-900-supersport-rom-for-cube-u30gt-h-111/. It uses a different method to flash the firmware but the instructions and flash tool are included.
Post script, 14 March 2014
After the Cube refused to startup again I tried to reinstall the firmware but my new Win8.1 PC refused to recognise the Cube when connected by USB. I tried a few different 64 bit rockchip drivers without success. Eventually I tried using an old laptop with 32 bit WinXP and it went fine: 32 bit driver worked, flash tool recognised the device and reinstalled the supersport firmware.