I am on Rogero 4.30 and there is multiMAN. It works. I don't know why you said "I missed multiMAN"!
I am not sure but will a 4.25to3.55 downgrader work dor 4.30? You kinda messed it up right there.
Try and enter recovery mode in the normal way (hold power button till PS3 turns on and turna off and again press and hold until you hear three consecutive beeps).
PS3 Slim 120GB
Rogero 4.30 CFW CEX
1TB TOSHIBA HDD
Playing: Need For Speed: Hot Pursuit, FIFA 13 and Sleeping Dogs
Wish to get: Hitman Absolution, Need For Speed: Most Wanted, Skyrim
Can't wait for: The Last of Us, GTA V