I did yesterday this tiny tool in Python that let you to proxy the firmware version validation with a custom version as I needed to register a PSN account and activate my PS3 (https://gbatemp.net/threads/on-ps3h...kg-with-rap-files-are-not-starting-it.578063/).
The link inside gbatemp https://gbatemp.net/download/ps3-proxy-for-custom-firmware-version.36846/ the tool is on github and is open to contribution https://github.com/Mte90/PS3-custom-fwversion-proxy
The link inside gbatemp https://gbatemp.net/download/ps3-proxy-for-custom-firmware-version.36846/ the tool is on github and is open to contribution https://github.com/Mte90/PS3-custom-fwversion-proxy