Not able to boot the beaglebone

Hi Guys,

I was trying to boot android from sd card on beaglebone black, as it was not booting up I have deleted the MLO from thumb drive of BBB.
Now am not able to boot the board itself(android or angstrom).

Could you please tell me how I can re-copy the MLO image, as its not even detecting the thumb drive now.

Please give me directions.

Kalyan Item 10.2