BE VERY CAREFUL, WATCH WHAT YOUR DOING !!!
When promted if I want to download and update to 5.0.1, I clicked ok
(but the next screen that popped was for 5.1, (not 5.0.1)
I quickly unplugged my JB4s, then clicked cancel on the screen.
SO BE CAREFUL, don't click on 5.0.1 without watching for what pops up in the next window. 😉