Thanks to both of you.
Indeed it makes a lot of sense to go to 5.1 OFW as I can't see if staying on 4.1 will yield much benefit. And games and DLCs requiring 5.0+ fw....
And the worst part is if I back up my 4.1 NAND and go to 5.1 with choi, then accidentally messed up autorcm, I'd boot 5.1 and...