From haxxxen on how to manually add an RSOD bypass to any PS3 CFW:
If you decrypt the 4.x basic_plugins.sprx, just search for: 409E002048000010 and replace with: 4800002048000010
This is based on rogero's 4.x bypass patch and i have only searched for it to patch it myself to lower 4.x cfws. I dunno if it is related to rsod, but he also added some trophy patch. I am using both of them
To patch np_trophy_util.sprx based on rogero, just search for: 419E00887B5E0020 and replace with: 480000887B5E0020
Finally, from Sony PS3 hacker cyberskunk: It is legit.. MD5 matches the one we got about a month ago.. REX has been 'almost' ready for that long to but I have been very busy with other non-PS3 things. Wont be long though..
Spoofers/Update Packages for 421-441 CEX/DEX/REX were finished earlier today but have not had a chance to get around to releasing them yet
It's coming.. I have been really busy but as I type this the build that I hope to be the final for this release is installing now..