Connie,
I had similar a month or so ago. I finally just held down power until it shutdown. Then I restarted and it came up fine and said it was installed correctly.
For what it is worth
Bart
Sent from my iPad
On Dec 9, 2011, at 3:48 PM, "Sanderson, Connie" <
email@hidden> wrote:
I have a 2011 MacBook Pro (Lion) that I began install of the EFI Firmware update on several hours ago…still going.
Is there any way to gracefully abort the installation without losing the o/s (and potentially hardware)?