What is the latest software version for the Blackberry Curve 8520?

I heard that the latest software was v4.5? and what's the difference between EDGE and OS 4.6.1 or OS 5.0? And lastly, do you know which of these two will be faster when connected on wi-fi? Thanks!

Me and my girlfriend both have a blackberry curve 8520 about a month old. When I had my blackberry and activated it for the internet I put it on my pc about 3 days later and told me to update to software v.5.0 when I put my girlfriends blackberry on...

i have os 4.6.1.314 and i'm trying to update to version 5. i've already downloaded two version 5 bundles but whenever i try to install from desktop manager, it says: "This BlackBerry® Device Software upgrade includes new features and significant...

I plugged my blackberry curve 8520 into my computer and my blackberry device messenger has updated the software automatically. It was updating things on my phone and as it finished my phone menu was different and everything was appearing as it does on...

I downloaded some apps of my Blackberry Curve 8520, and rebooted it - however, it did not return to the home screen as it normally does, and it's now showing a white screen with the message "Reload Software: 552" on it. I've tried pulling the...

okay, well my blackberry curve 8520, i got it in september off my nan for my 13th:) and then at the start of the year the 'e' and the delete button went dodgey and wouldnt work unless i pressed down really hard, one day my phone froze so restarted it...

where can i get the new version software 4.5 OS for the blackberry curve 8320 for tmobile?is it even out yet?if not when will it be released?where can i get the software update thanks.