Originally Posted by UrsusVIIILXXXVII
You have to be running stock. If you've rooted but haven't removed any stock apps or installed a custom rom, you can take the update.
Or altered any stock files. I used NinjaMorph
to change my Settings icons
and .605 failed to install. I'm sure .621 will also. If root works after .621 I may have to SBF and take it just for the Menu light buttons fix. That has bugged the fudge out of me too.