I bricked my yesterday ;) But I found all necessary information to recover it here in the Forum.
You can force a reset by using a usb power device (eg. iphone adapter etc) but it work also with a computer usb interface.
plug your bb as soon the green light went of unplug the bb and repeat this step for min. 3 times (better 4-5) then plug in the BB again and let it boot. After a short time it should start blinking red. The reset is running, DON`T UNPLUG the Bunny. When the LED is green, the reset is finished.
The reset would not delete the payload folder, its content nor will recover the payload partition.
If you have a problem with an input/output error, like me yesterday, then try this:
But I would say, just start playing and look what you get ;) If you brick it then is the time so search for a solution ;)