You'll need more than just an .alx file, you'll need a full handheld software package. I haven't noticed any released yet
The cingular theme doesn't exist anymore either, it's been replaced with a similar AT&T theme
Contact O2 and let them know that you had a boo boo on your device and need the installation package to reinstall your OS. If you get it, I'd be interested in getting it too.
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