Restore BBB (accidentally formated BBB onboard memory)

Hello, Everyone!

I have a issue with BBB I can’t mount any image anymore, also no other led lights are not lighting up except pwr. I accidentally formated my BBB memory with diskpart and created new partition. I wonder if there is some instructuctions how to upload new flasher and default filesystem to BBB onboard memory?
Also I forgot mention that my window 7 wont recognize anymore BBB. What can I do?..

Thanks for Your help!