Hi ,
i think what you are after is PnP III which basically will give you almost everything you had before bar the messaging facilities ; and also a lot more besides .
I think it would be worth waiting a while though as you could go through the process and have your Joggler update again automatically to what O2 want .
While you are waiting for things to settle with the above you could try out one of the many images that the joggler will happily boot i.e Joli os , Xubuntu , Mint , Android both Gingerbread and ICS (found on mobiles ) , or XP .
The process is simple and great fun once you have managed to master the simple steps required.
Basically , download the image of your choice usually from the first post of the thread of the OS in question ; click on the file you downloaded and extract it to say your desktop , the file will now end in .img.
All you do now is write it to a usb stick (8gb will do for most) using
https://launchpad.net/win32-image-writer (version 0.3 worked best for me )
Plug it in to your joggler , power on and you are good to go .
This would be a good starting point for you
http://www.jogglerwiki.com/forum/viewto ... ?f=2&t=411
or Joli Os from Buzz,s site is excellent for your needs .
http://joggler.exotica.org.uk/jolicloud/
It might sound daunting but is great when you manage to get there
Just ask if you get stuck
I
The instructions on this thread