Don't worry about it as I have now completely hosed it. tried uploading the b11 firmware again and said "let me try something" so I powered off part way through the upgrade. Now I get the orange light for a few seconds, yellow light for a few seconds, five fast blinking yellow lights and then solid yellow. Can't get back to 192.168.0.50 page.
If I hold the reset in while applying power I get 4 slow blinking yellow, a solid yellow for a few seconds and then slow blinking yellow, when I release the reset button it continues the slow blinking yellow