I have a ps3, model 20xx, that is on firmware 4.82 but the factory firmware is 3.66, can I install a CFW?
In the PS3Xploit Tools 2.0 thread, http://www.psx-place.com/threads/ps3xploit-tools-v2-0-improved-flash-writers-dumpers-even-easier-to-install-cfw-on-4-82-ofw.16139, they say this...