Guys just in case you missed it, I updated to Rogero CFW 4.30 without problems on SLIM and NAND ps3 consoles, here you can see my procedure and details:
http://www.ps3hax.net/showthread.php...897#post462897
EDIT: Let me quote myself for the lazy ones xD...
PS3 Model: [CECH-2501A][Slim][Rogero CFW 4.21 v1.09]
1- Downgraded from Rogero CFW 4.21 (v1.09) via Recovery Menu using Rogero 4.25-to-3.55 PS3UPDAT.PUP [MD5: 49d80e07fc1f5ca1b0840e02e94635db]
2- Installed Toggle QA PKG [3 beeps + back to XMB][Tested combo, OK]
3- Updated via Recovery Menu to Rogero CFW 3.55 (v3.7) [MD5: 8f8166b25d6bed891f292c77de5c4b28]
4- Tested QA combo, everything OK.
5- Updated via Recovery Menu to Rogero CFW 4.30 (v1.0) [MD5: 7ef38c26482465b939a8ab5e960f165c]
6- Happy Ending! multiMAN v04.08.01 working OK 
PS3 Model: [CECH-E01][NAND][Rogero CFW 4.21 v1.09]
...same procedure as slim  , everything OK.
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I recommend people to make sure every little detail is done, don't leave discs on your console while doing these updates, if you are not 100% sure of what your are going to do, just do not do it, or look for someone who knows.
Take care!
Btw, as extra note, Tested Need For Speed Most Wanted, and its working like a charm, tested Resident Evil 6 and is working fine as well, no bugs or errors with any game I have.
If anyone get back screens with games, activate BD Mirror on multiMAN and it might fix your issues
.
SeeYa!
