PSA: Don't upgrade your PS3 to 4.83 if you want to use CFW : r/emulation
How To Downgrade PS3 Firmware (Tutorial) - 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! , psx place multiman - thirstymag.com