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Also, once you are on FW 3.55 you'll have to enter Factory Service Mode, to do that either [http://www.ps3hax.net/showthread.php?t=33989 follow this] (see Chapter 2, Part 1), or use one of [http://www.ps3devwiki.com/wiki/Talk:Downgrading_with_PSgrade_Dongle these devices].
[http://www.ps3hax.net/showthread.php?t=26677 Tutorial on going from OFW 3.55 to CFW 3.55]
[http://www.ps3hax.net/2013/02/tutorial-how-to-install-4-30-ps3-cfw-from-3-55-cfw/ Upgrading from CFW 3.55 to CFW 4.30]
