Inspired by the Resigner of PS3 homebrew and exploiting the new 4.31 Appldr Keys, I created DarkEboot Fixer v2.0 that will allow you to fix all PlayStation 3 EBOOT games requiring up to PS3 Firmware 4.31 to be able to start on 3.55 CFW.
Download links and...
Added full support for 4.21REX (REBUG) firmware
Added support for 4.21REX in DEX full mode (DEX flash + DEX lv2 kernel)
Added support for PS1 disc backups for 4.21REX CFW in DEX/DEX mode
Added support for direct-disc-access for 4.21REX CFW in DEX/DEX mode (data CD/DVD/BD discs)
Added support for flashing 256MB NAND *.EID0.NANDBIN backups
It has been a long time since the last firmware release, mainly because we did not see a reason to keep releasing cfw after cfw just to changes files in ‘dev_flash’. We wanted the next release to be something different and we are quietly confident it is.
To quote, roughly translated: SGK Spoof is compatible with 4.31 ReActPSN and good PSN games online!
Make sure that you do not have to install Spoof if you have one...