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I looked into this, finding out more information!
All Dex users: All Dex Custom firmware are patch (unless they come out with a spoofer) The only Dex firmware that can go online is Rebug 4.46.1 with a Spoofer!
Spoofer::::
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I DO NOT TAKE CREDIT!
It is safe to downgrage from PS3ITA 4.55 and 4.50 to Rebug 4.46.1 you will NOT brick i promise you that.....
To use the spoofer just make sure you have rebug toolbox, and put system mode to normal, then install the PKG! after its installed, go to rebug toolbox and put system mode to REBUG! (Its safe to delete the PKG)
NOTE: if you want to remove spoofer, just simply use toolbox and put system mode to normal, and you can upgrade system firmware if you needed to! To put spoofer on go to toolbox and put system mode to REBUG! that simple
I personally loved PS3ITA 4.50, its a shame that it got patch

Damn sony!!!!! Hotfixing SMHH
AGAIN I DO NOT TAKE CREDIT, Just want to help!