I have the pkg and it would not resign for 4.21 and i allready used the 9.99 to try change my psid then back to rex4.21.i will post the info i found for this app.i beleave you need to install special pup.however here is the info i found for this.without goint to demonhades.FOR PS3 CFW 3.55
5) Install The CFW 3.55 Otheros ++
6) Install the PKG Chaos Air Bringer and insert a usb key or external HDD...
7) Run Chaos Air Bringer and the hombrew will make a save (MAC ADRESS) on your usb key "mac_original.bin" . Warning copy the file mac_original.bin on your computer.
8 ) Make a new file "mac.bin" with a true mac adress PS3. Make a good MAC adress Creating a New PS3 MAC Address (pcfreak30 informations).
9) Copy the file mac.bin on your usb key or external HDD...
10) Insert the usb key or external HDD... on your PS3 and Run Chaos air Bringer .
11) Now turn off your PS3 .
12) Turn On your PS3 , now go on system settings ---> system information , and look your MAC adress have changed.
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the needed pkg.
please let me know how it goes.many thanks.