I do not recommend to try it without a flasher installed and a dump of the flash.
To quote, roughly translated: Hi all, What better than to come back with this kind of news! Our friend and SGK developer releases today the result of hard work. Indeed, in the shadow he worked to bring us a CFW with features interesting and not yet seen the new CFW 4.xx
The basis of this CFW is based on Rogero 4.30 and the 4.21 Rebug CFW which is the most stable and most successful of the moment. He added SGKXMBM + Package Manager for our greatest pleasure. Some files from firmware 4.31 which ensures compatibility for the latest keysets. So you can play your backups favorites without a patch or fix. 4.31 is a spoof includes access to PSN and avoid unintended updates.
Added package SGKXMBM +
Lv1 Lv2 and recompiled.
Patched Peek & POKE
Coldboot game replaced
Theme changed from dynamic watch dogs
Testers and developers: consolehackdev / ZZ / dedalo! Teamsgk/ps3devs; SGK_84
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!
To quote, roughly translated: Hi to all sorry for the problem of the slim CFW 4.40 V5 I report today! My CFW 4.41.05 with full access to the PSN + 3 fashion CDEX 4.41 FULL fashion, mode CEX 4.41 FULL, and DEX fashion SPOOFER 4.30 4.41.
1: Replacement coldboot audio and video
2: Replacement lines.qrc RETIRED BUG FOR MULTI REGION
3: News icon by Hackxell
4: Ameloiration the toolbox Rebug for normal mode, CDEX and DEX
5: NORMAL MODE 4.41/access PSN and compatible ReActPSN
6: CDEX fashion 4.41/ajout option DEX style fake save data owner and compatible PSN and ReActPSN
7: DEX 4.30/ajout MODE FUNCTION TOOL DEX miralatijera
8: Adding style toolbox PSIDPatcher 4.41 Rogero
9: Correction launch minis that launched a black screen
10: Replacement minis colbboot
To set the debug menu in NORMAL mode setting on the XMB parameter has been made and then networks (L1 L2 L3 R1 R2 DOWN TO BELIEVE DIRECTIONAL) CDEX MODE AND DEX AND THE DEBUG MENU SHOW
1: Installable on all CFW 3.55 4.21 4.30 4.31 4.40 AND 4.41
2: Still have the QA flag enabled and system update debug ON
3: Copy the PUP in your USB key in PS3/UPDATE
4: From XMB (CFW4.41 cfw4.40 cfw4.31-cfw4.30-cfw421-cfw3.55)
5: A system update
6: Update from support storage
I'm glad the change log mentions its updated to not give the no txt BSOD SGK gave me with the last firmware they released... Wow the issues that caused, scares me from SGK. Seems they are doing too much to add many new CFW specific features, they are not making it all as stable as it should be, not to forget the language issues with icons in the XMB on many of those features.
Every time we do something like upgrade to new CFW we take a risk of brick, we do it knowing this, be aware SGK gave me a BSOD and I got NO HELP from SGK to fix it, I had to figure out a way to save my PS3 that NOBODY else could... So install at your own risk, and be aware if you get bricked by it and its a no txt BSOD you will need an additional hard drive in NTSC to trick the system into recovering the system.