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Downgrade with the n900?
Downgrade is yet not possible with any other device but a PSJailbreak, which retails at $99 bucks. Eventually, we'll see a open source version, that im sure will be ported to every single device the scene will see.
So, sit tight and be patient. Besides, from the looks of it, the process is...... You gotta wait some 5 mins for it all to finish and your hard drive gets erased each time. That kind of sucks =p... But you can get on PSN and buy a game and use it. =)