We reported a firmware 4.0 mod by a developer name ps3hen here. Today he has released an updated version of his mod, namely PS3 4.0 Hybrid Firmware. In this second release he has added debug XMB items, the removal of the PS Plus item and cinavia removal. Please note that this requires you to be on custom firmware 3.55 and below, also a hardware flasher is required.
To Quote:
Following up on the previous update of my PS3 4.00 Dev_Flash mod, today I've released version 2 of my PS3 4.00 HFW (Hybrid Firmware).
Remember only retail signed .pkg can be installed with this. Have fun. THIS HFW WILL NOT ALLOW HOMEBREW!
An important message for users upgrading from a QA Flagged console: If this console is updated to my 4.00HFW from a QA Flagged console, it will not be able to access the extra System Settings provided by QA Flagging. However all settings made with the QA Debug Settings will remain, EXCEPT "System Debug Update".
Extra Credits: This HFW uses the "XMB File Manager" by DeViL303 which is a modification of Team Rebug's "Packages Manager".
Changelog v2:
Adds "Debug XMB Items" to the XMB Column "PlayStation Network" (contains the Debug items found in this column, originally for DEX)
Removes the useless "PlayStation Plus" XMB item from the XMB Column "PlayStation Network"
Disables Cinavia DRM on all media except Blue-ray.
Installation:
Be on a firmware 3.55 or less
Install the .pup through the XMB (Make sure you have a working hardware flasher as there is no other way to downgrade)
Download: PS3 4.0 Hybrid Firmware v2 https://rapidshare.com/#!download|848l34|2918989466|modded_FW_4.00_releasev2_.PUP|188995|R~CD5729711D29C60305BA3E1E7B9072D0|0|0