do it again and hold the power button with one of the volume buttons (i forgot it was + or -) a screen like this should show. mine is also at 30%
for more info you can refer here http://xdaforums.com/showthread.php?p=53006843#post53006843
well at least yours you can have that screen up. mine has no recovery so i cant even see whats the issue causing the update to fail.
