...Messenger 5.0? blackberry pearl 8100 version 4.2.1.108 needs BB Messenger 5.0
blackberry pearl 8100 version 4.2.1.108 needs BB Messenger 5.0
blackberry pearl 8100 version 4.2.1.108 needs BB Messenger 5.0
blackberry pearl 8100 version 4.2.1.108 needs BB Messenger 5.0

Can someone please tell me how can I upgrade the blackberry messenger to 5.0?
Things you should know..
1) I cant loose my contacts, I can't afford it (long story)
2) I cant use the browser, i only get blackberry messenger (should be via usb)

PLEASE HELP :S