Questions on CFW and HEN jailbreak

Hi everyone,

I would like to jailbreak two of mine ps3 and I'm totally new to this kind of thing.

The models are:

PS3 Slim CECH-2004B
Date Code: 0A
Firmware: 4.89

and

PS3 Super Slim CECH-4204A
Date Code: 3C
Firmware: 4.80

I would like to install the CFW on the CECH-2004B and HEN on the CECH-4204A.

So my questions are:

1) Is my CECH-2004B model compatible with CFW ?
2) Should I update both console before jailbreak it ? Or is it better to jailbreak it with the current firmware...

Questions on CFW and HEN jailbreak