This update allows you to install and enjoy all the games that requires FW 5.55 and 6.00 without having to patch anything.
Things you have to take note of:
• This CFW is for PSP-1000 and PSP-2000 v1 and v2 ONLY
• The 5.03HEN-A will be updated shortly with the same opportunities
Roughly translated changelog:
• Ability to run 5.51 + games without having to patch (UMD or ISO)
• Ability to run protected games like Soul Calibur or FMA example (UMD or ISO)
• To launching PSN demos requiring 5.51 + without having to patch them as AMS
• Connection via PSN MEDIAGO without having to install complicated utility (option in beta yet)
• Possibility to use the XGEN Updater to install the official firmware 6.10 (For use only if you have a Pandora XGEN handy to be able to return later in Custom firmware.
• IRShell can no longer launch ISO patch but the patch will be released in a few minutes
• Video playback 480x272 raises concerns but a fix is being studied.
• The option to accelerate the reading of MS is being ported to 5.50GEN.
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 came here to confirm this. From the sound of things the C update switches the ISO driver to something aside from the M33 one which is what is usually used, although there are other problems reported.
One final thing to report, it seems the GEN team is working on GEN-D now to fix all the bugs in GEN-C.