3.55 fixes for BLJM 60554 (Metal Gear Rising : Revangenace)

pls help me.

i have downloaded MGR JP version, and looking for fixes 3.55. but i cant find it using google.

is there anyway that i can upgrade to 4.21 Rebug in a safe and simple way that will not brick my PS3 easily.

or is there any 3.55 fixes that anyone can help me pls.

Thanks