Jeff Shertz gives some pithy advice in his article on how to upgrade your Lync Phone Edition phones. I had to laugh and thought I would pass it on:
Now, do nothing. Seriously, just leave the phone alone. Don’t unlock it or push any buttons. Don’t even look at it. In fact, go to lunch.Jeff, you know us IT people too well. ;-)
Also, make sure you stop by Jeff's blog. Excellent Lync blog with very good articles.
Here is source:
ps-I actually did NOT touch the phone. ;-) It is now effortlessly Lync Phone Edition v 4.0.7577.296.