Newbie queries reg. Beaglebone Black rev 'C'

Hello,

I have few queries related to Beaglebone Black Revision ‘C’

  1. Which is the pre-installed bootloader that comes on a fresh board. ?

  2. Can one modify the bootloader code and re-flash the board with new modified bootloader?

  3. Does the kit has the required accessories to flash new bootloader image in case bootloader gets corrupted?

  4. Does the kit has the accessories to debug both the bootloader and kernel?

Thanks,
-prince