Developer playerkp420 hat die erste 4.78 Dualboot Firmware released.
PLAYERKP420 4.78 DUALBOOT
I have made a DB OFW, that should be better for making coreos patch. The file size is exactly the same as OFW. Even if you unpack it, lv0 and spu_pkg_rvk_verifier.self, they are the same size. (The only 2 files that are patched to allow reinstall of CFW)
DOWNLOAD:http://www.mediafire.com/download/b3ov4md7q3dx2j7/Playerkp420_DB.OFW_4.78_PS3UPDAT.PUP