Connect the USB stick to the USB port furthest to the right of your console and start the console in recovery mode
Select option 6 (System Update), and follow the instructions that appear on the screen.
Once finished, enjoy the CFW 4.21.
Update: They have now released (via ps3-solution-pour-tous.doomby.com/blog/news-ps3/cfw-arch-4-21-finale-version-0-1-for-all-ps3.html) PS3 CFW Arch CEX 4.21 Final v0.1 for both PS3 Fat and Slim consoles (above) for those interested!
Stay tuned for more PS3 Hacks and PS3 CFW news, follow us on Twitter and be sure to drop by the PS3 Hacks and PS3 Custom Firmware Forums for the latest PlayStation 3 scene updates and homebrew releases!
I holds to clarify certain points, the patch included in this CFW are not by all provides in PS3MFW (patch ps1, does not exist, and patch NO_Check functions that if I modify file TCL me even on Rebug Base).
The image of the coldboot is of my realization, the audio east took on Internet and I like it, it is for that that it is there.
The category has the homebrew Channel comes from file XML and RCO on the basis of an already existing base. (nothing very complicated it inside and not time to delay me above it).
It is always easy to criticize the work of the others. If you do not like, and pass your road, are not made you to like this CFW!
But at least it has the merit to exist and bring some additions interesting.
To download it here the new bond: http://www.fileserve.com/file/FaJTCrH
"The Homebrew Channel" w/ PKG Manager sounds like NFW v3 to me, and the Cinavia patch is useless on this as Cinavia IS already disabled in REBUG, but yah all this can be done through PS3MFW Builder with all the available tcl