PS4 Recently came across a PS4 on 9.00, should I upgrade?

[PhoenixARC]

so I came across a PS4 on 9.00, which is great! but I'm not sure if 9.00 is still the recommended firmware to mod the console with, should I update to 11.00? or maybe another version in between?

 

[RoboKing's Cosmos]

Save your sflash0 first before updating so that you can revert.