Hi I am Gonna Tell You How To Bypass The Xbox 360 19th May Update For Flashed Xbox's Please Note That Im Not Responsible If You Get banned.

First Update Your Xbox If You Want
Then When Its Updating Rapidly Press The Open Close Button
You Cant Let it Close For Even A Minute Close It And Open For
The Hole Update And When The Update Finishes You Should Be Able
To Play Your ISO Disks


PLEASE NOTE IM NOT RESPONSIBLE IF IT DOES NOT WORK FOR YOU OR IF YOU GET BANNED

BUT THAT WAY WORKED FOR ME