JUST upgraded from ROGERO CFW 4.30 (v1.0) directly to v2.03.
Steps as follows :-
1) Download the latest 2.3 PUP
2) Save in USB, check the MD5.
3) No need to enable toggle_qa, since already done on 3.55 the first time.SO, no need to use it again
4) Upgrade directly thru XMB without downgrading to 3.55.
5) The upgrade takes about 5 minutes to complete.
6) Tested some newest games, works seemlessly, no problem.
I can't believe it is SO EASY.... many thanks to the great work done by Rogero.