UPDATE 1 Confirmed: PS3 3.56 currently kills homebrew – installing over with current existing CFW’s does NOT work. According to PSX-Scene the new update contains a new .SELF with an unknown KEY and all homebrew tools will have to be updated in order to restore their functionality. You can also read a log of what a few devs are thinking of v3.56 HERE. Good ole’ KaKaRoToKS is hard at work in cracking the new firmware, updates from his Twitter: isoldr keys are now pushed too. lv1 and lv2 keys are now pushed to my ps3keys repo.. more coming : http://github.com/kakaroto/ps3keys pup from ps3utils and puppack/pupunpack from ps3tools in github.com/kakaroto can now pack/unpack 3.56 correctly. Stay tuned at PS3Hax for the fasted updates on the new firmware.UPDATE 2
Source