78w ago - Shortly after the PS3 Firmware 4.00 Dev_Flash dump by UpSilon I have posted my method and video (below) for PS3 Demo / Kiosk console owners.

Download: PS3 Firmware 4.00 Dev_Flash Dump for PS3 Demo / Kiosk

WARNING: Modifying dev_flash can be very dangerous! USE AT YOUR OWN RISK!!!

For this you will need two hard drives a e3 flasher or similar device to downgrade your PS3 (assuming that your on firmware 4.00 and you have an e3 flasher)

• downgrade to 3.55 using the downgrade tools from e3
  
• once booted back into the xmb turn off the console
  
• swap hard drives turn on the system, press the PS button and you will be asked to reinstall the firmware
  
• place the pup file from the e3 downgrade tools in the normal PS3/UPDATE usb folder and follow the on-screen instructions to reinstall the firmware
  
• then install dev_blind.pkg & Blackb0x FTP from install packages
  
• run dev_blind then BlackB0x and FTP into the console
  
• goto /dev_blind delete everything and replace them with the files included in the download when finished...

78w ago - A few weeks back PS3 Firmware 4.0 was released, and recently French PlayStation 3 developer UpSilon has made available a dump of the dev_flash contents for others who wish to examine it alongside a previous version below.

Download: PlayStation 3 Firmware 4.00 Dev_Flash Dump / PlayStation 3 Firmware 3.73 Dev_Flash Dump

To quote, roughly translated: UpSilon, French developer already known to have deciphered some files on the console of Nintendo 3DS, ext today through his blog, the dump dev_flash firmware 4.00.

For information, dev_flash is a very sensitive part of the PS3 NAND which contains many key information such as firmware, the numbers of encryption running games and other programs, or other important files firmware. The dump of this part could therefore, if a developer managed to unpack, to facilitate the establishment of a CFW 4.00.

Upsilon also announced it has started working on the reactivation of the Service Mode (Jailbreak) on 3.56 + firmware.

From UpSilon's page: Here is a dump of the version...