Yeah I have a Rooted AT&T HTC Inspire 4g, and a few days ago I got an at&t text message stateing that there is a new critical system update, OK so I downloaded the update from Settings>AT&T Software Update>Check for updates and now in my notifications bar it says "System update is ready Tap to install the system update" OK So I click install it says I cannot use the phone ect ect while updating, I click install now, the phone powers down and boots back up first the white HTC screen then goes straight to a black screen with a little android guy and a Triangle with a " ! " in it, and does nothing at all (ive waited) its erroring for some reason and I cant figure it out please help! 
