I wanted to share my working 4.75 MFW. Made from OFW 4.75 .PUP file. Will play backup games that need 4.75 or lower, if game manager has been updated for 4.75 CFW.
It has been tested on different models by me and @bbb21, on these models:
CECHH01, CECHK01, CECH-2001, CECH-2101, CECH-2501A. [But 341 downloads at time of posting this, makes me thinks more models]
Download: Playerkp420 4.75
md5=6E231C3F3E15BAA72A2EA4E380C231A3 @DEFAULTDNB
The only bug I have found, is that when System Update debug is enable in Qa Flag – Debug Settings. An error is given when trying to update from System Storage. But if System Update debug stays disabled, you can install any CFW version from XMB or the Recovery menu.
Can be installed from any OFW version the same or lower than 3.55.
Can be installed from any CFW version 4.75 or lower syscon version. Or if Qa flag enabled can be installed from any CFW syscon version 9.99 or lower. (only with system update debug disabled, like stated above.)
Can be installed after hardware flashing with noFSM Method patches. Habib’s standalone qa flag works to enable qa flag, even if the token has never been enabled on 3.55.
There is a guide at the end of the post. to make your own. Which will also have links to a noBD version and RSOD/noBT version soon.
CFW-PS3 