(adsbygoogle = window.adsbygoogle || []).push({}); i have a fat Ps3 CECHG and i was wondering if it can be downgrade by E3 Flasher it can be downgrade to 3.50 or something like that

You'll have to get a ProgSkeet and solder it since the console is a NAND PS3, not NOR which is what E3s are designed for.

i got a 4.31 CECH25xxA slim can that be downgraded and i can use my old 3.55 as 4.31 and switch it all around?

Look on this chart:
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And I don't understand what you mean in the last part of your sentence.

"and i can use my old 3.55 as 4.31 and switch it all around?"