today Frodo The Hobbit reports that PS3 Debug / Test Firmware version 4.01 has now been leaked as well.
Download: PS3 Debug / Test Firmware 4.01 / Dev_Flash CoreOS Unpack 4.01 Dex / PS3 Debug / Test Firmware 4.01 (Mirror: SCEA / SC3APR)
To quote, roughly translated: "Very soon after its released version 4.00 debug Sony decides to release a Firmware 4.01 for stamped its consoles Test / Debug. We remind you that this type of firmware is not installed on the consoles so-called "Retail" we just buy in the store.
No changelog available at this time. See us before long a 4.01 in our living room, only time will tell. The file is available for download if you want to update your console to Test / Debug."
As always, these PUP updates will currently NOT install on a retail PS3, and so they are intended for examination and comparison purposes only.
We have 100% confirmed that running this updater on a retail PS3 will not damage it, however, it will give the following error before the installation completes: The data type is not supported. (8002F029)