Bbb bricked well updating upgrading in angstrom

I pulled the bbb out of the box, powered it up.
All great so far.
I did a update upgrade.
The bbb locked up, because the update was too big for the memory.
Now the bbb is locked up, wont boot.
Where can I find newbie instructions ( step by step) to access board, erase angstom, and install ubuntu.
( is ubuntu a good choice for a newb gui.)

I would check the support Wiki.