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Unfortunately my son updated my PS3 to 3.56

(bless him!) so just about to buy a used PS3 with 3.55 CFW. I planned to get a second one anyway so no damage done, I hope.
I would appreciate some advice please. I know this is a bit nooby :dunce: so apologies in advance but some of the threads have conflicting views and are misleading so I was hoping for some clarity from here,
What CFW should I install? Had geohot last time but keep reading Kmeaw bypass is easier and more secure?
When updated to 3.56 the MW patch stayed, trouble is it was very unstable so I was forced to reinstall the official MW patch so question is can I install game patches on my 3.56 console by connecting the 2 consoles?
If so what is the correct cable to use?
Any other advice I should be aware of would be much appreciated
Thanks in advance