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Beta version features:

• Bluedisk Core_OS patched CFW to 4.25 OFW aim_spu_module.self
  
• Consistent backup games 4. + Or original games
  
• SEN original connection
  
• Spoof 04.25
  
• Compatible FckPSN
  
• Ca.cer version 4.25 (except CA27.cer)
  

How install:

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• Do not install if the console has received a downgrade earlier
  
• Do not install console-DEX
  
• Install OFW from 3:55
  

Steps:

• Download and install the official firmware 3.55: You must login or register to view this content.
  
• Prepare a USB stick formatted in FAT32 and create a folder called PS3, then in that same folder, create another one called "UPDATE" in which to copy the file (PUPs should be renamed PS3UPDAT.PUP).
  
• Connect the USB to the console and turn it on.
  
• Install 3.55 OFW through the XMB
  
• Once the firmware is istallatoo, download and unzip CFW 4.21 Arch
  
• Replace the PS3 folder on your USB stick into one file provided by the CFW Arch 4.21: You must login or register to view this content.
  
• Connect the USB stick to the USB port furthest to the right of your console and start the console in recovery mode
  
• Select option 6 (System Update), and follow the instructions that appear on the screen.
  
• Once finished, enjoy the CFW 4.21.
  

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first ... I suggest to not install this cfw because it is a beta version; better to wait stable versions .... this also applies to rogero CFW.

if u rehash ur console i think u can install this withou problem but im not sure!