How To Downgrade your PS3 from Any 4.83 CFW To Rebug CFW Jailbreak PS3 Only - YouTube
PS3 News: multiMAN 4.85 released coming with support for CFW 4.83 to 4.85 - First update to this highly popular backup manager since the release of FW 4.82! - Wololo.net
DON'T UPDATE Your PS3 Firmware Version To 4.83! (CFW PS3 Only) - YouTube
PS3: CFW Evilnat 4.89 Cobra 8.3 (CEX) released - Wololo.net