Unfortunatly, you need 3.55 to get 4.30CFW running on your console, because 3.55 is the only firmware were we got the private key for (METLDR),
So how does this work
The 4.30 firmware gets decrypted with all the leaked codes (bootldr lv0-2 ands so on)
Than they can mod it and encrypt the firmware with 3.55 keys,
If we ever find the private key of 4.30+ (not stored on console) than we have 4.30 CFW for OFW