http://talk.maemo.org/showthread.php...16#post1140016

But AIR you don't have to change PR_code, you can just use one of the other fw images.*
You don't have to use a fw image that matches your model no. etc.

In fact I've seen more recommendations against changing PR_code than for.
There's a thread or 3 in the N9/950 sub-forum now by one guy...
He's gotten himself into all sorts of trouble by going down that route.
He was mostly unlucky though IIRC....

*There's rules about which one you can use e.g. PR_code/no. must be equal or higher than your current fw.