Firmware not rooted
Re-flash with your chosen rooted firmware. You do have a copy stored don't you. This flash should be as full as possible, [Erase NAND (IDB)] and full ROMflash.
Recovery boot loop
I had this while experimenting with changes to boot.img, the tab would only boot to recovery. I could neither boot normally or start in flash mode.
Fix
Connect the Cube to thePC and start up the flash tool from the tool kit. Put the mouse pointer over the boot to flash button. Start the tab. As soon as the tab is recognised by the tool click the boot to flash button. Now you should be able to [Erase NAND (IDB)] and re-flash.
BAD Flash
I've had this due to poor USB cable, for me the cable supplied with the cube is 100% reliable, I'd suggest if you find a reliable cable you stick to it.
Fix 1
start the flash tool
connect the cube
press power for 15 seconds to force power off
press vol + then press power and keep them pressed for 4 seconds releasing power then vol +
if the cube is recognised then either click boot to flash mode or [Erase NAND (IDB)]and re-flash.
Fix 2 (See this postat Flash My Android unbricking )
hold power for 15seconds and release to force the cube off.
Take the cube apart youwill need some small cross head screwdrivers.
Short the two pads identified in the above link and press and hold power on for 3 seconds
Hopefully the Cube will start in a flash recovery mode (not CWM), you want the fullest format and flash possible for this one so either [Erase NAND (IDB)] andre-flash with the tool from my rom kit, or if you are using RKBATCH use restore
Damo has posted auseful thread on flashing using rkbatch here.
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