You need the cable for it. But basically, connect it to the computer and go into the Blackberry Desktop manager. Then it should come up with something asking you if you want to update it and there's something else on there (can't remember which ones they are). Anyway, click update and then it should be done. I'll link you anyway cos I'm rubbish at explaining these sorts of things haha. It does wipe everything off the phone though, all your pictures, apps, games, messages, contacts etc so make sure you have them all backed up before you do it. I made the mistake of not backing it up and lost everything. Spent an hour putting all the numbers back in
Anyway, here's the link for you :) It says to take the battery out but I did and it stopped the update halfway through about 5 times. I put the battery in and it worked then
http://btsc.webapps.blackberry.com/b...alId=KB10 144
Hope this all helps :)