hfw

Hi, i'm new here I'm a bit confused, i found many tuto about the 4.84 hfw and 4.84.2 hfw 1-what's the difference between 4.84 & 4.84.2 ? 2-why i use HAN enabler instead of installing cfw 4.84? 3-what exactly the supported ps3 models? many tuto and some said not all ps3 and others said all...