you can data transfer from 3.72 to 3.55 cfw..........all u need to do is download 3.72 spoofer install on your jailbroken ps3 then open it and then follow instructions on how to activate and deactivate the spoofer....when you have activated it just data tranfer from 3.72 to the 3.55cfw (spoofed) ps3 as you would normally data tranfer from 3.55cfw to 3.72ofw then once you done that just install the spoofer on 3.55 ps3 cause you would lost it when you data tranferd and deactivate the spoofer DONE eveything on your 3.72 ps3 will be on your 3.55 ps3 kk bro sweet i put links to the spoofer for 3.55 below.
3.72_Version_Spoofer_2.0_355.geohot.pkg
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I recommend you dont update to 3.73 other wise you will not be able to use spoofer cause there aint one for 3.73.