Tim 2D is "Official Firmware" Tim 4E is "Modded Rom" (Work in progress) My Pad will not unmount in Tim4E, You can go to Settings, SD Card & Device storage to unmount. If you have a x576 screen you will see an "offset" for your screen, simply launch the GScript application, scroll at the bottom and click on the 1024x576 fix. then reboot. You have to do that only once If ever it goes wrong, well that means that you have most likely flashed another bootloader before. Just put the bootloader for your screen and reflash the rom in that case.