The thread you need for the software is here:
http://www.blackberryforums.com/gene...ilanguage.html
There are instructions to install in the first post, although you may wish to backup your data with desktop manager and then wipe with JL_Cmdr just to be sure.
The info you need for this is here:
How do I wipe the BlackBerry using Jl Cmder? - BlackBerryFAQ