As previously reported, those with converted PS3 consoles should hold off installing this update as it will brick your system.
From the included Readme_DECH-441_001_e.txt file:
Contents of This Package
Changes in Release 441.001
<System Software (GUI)>
- The update data for debugging station has been updated at the same timing as the release of the system software 4.41.
This update does not affect titles....
Your PS3 must be wired, it will not work if you're using WiFi
Ok first, start ProDG Target Manager and go on "Search For Targets" then press the refresh button to start scanning, if all is ok your PS3 should be detected, just right click on it and move it to "Debugging Station" group then double click on it, it will add your PS3 into your targets list.
58w ago - Following the recent 4.30 DEX Warning, this weekend DemonHades reports that Team Mate (via Checko) have now leaked the Sony PS3 Debug / Test (DEX) Firmware 4.25 update which has been confirmed working by several Spanish PlayStation 3 developers.