Use update 4.4 or more!!!!
I was on Rogero 4.3 v2.05 and when I inserted a disc it wont show so i thought to go back to OFW 3.55 and re-update.
So I used rogero downgrade PUP and get 4.21 in sys info. But now when I try to install rogero 3.55 it asks me to install update of ver 4.4 or newer (yes 4.4 its not a mistake)
and its not installing 4.3 as well.
If I try to onstall from XMB it copy the update files and when it restarts It says I am already on the latest ver.