I have installed the Lastest OS 4.0.55, but I have so many problems..
1st - When I open the BlackBerry Messenger, everytimes the BB ask me " You've got switched to a new device, do you want to erase your contact list ?"
2nd - Google Maps 2.2 doesn't work on it, it Blocked at 90% of the start

Somebody have an idea ?

Regards

Have you already checked through the thread for the OS you upgraded to? People tend to post their experiences and issues in those threads after upgrading.

Yep, and those questions hae been answered.

The Google Maps issue is an issue with your BES. No workaround except for loading an earlier version of the OS or earlier version of Google Maps. There is a sticky thread in the Beta You Than Me forum for the Google Maps issue.