Looks like 3xx version has a bug. When I press hardware "Main Menu" button on my PB 301+ device CR3 hands up with hourglass cursor. After some time (while it's still hanging) when I once again press Main Menu button--the device resets itself.
Here is the crash log:
http://ge.tt/3zNTVJK2/v/0
There's no such issue with
pkb version.