There is no firmware to downgrade a PS3 all these sites/youtube vid's claiming that you can downgrade or install custom firmware are fake crap that want you to do a survey or something.
The only way you can install custom firmware is to have a PS3 on Sony official firmware 3.55 or below, above 3.55 Sony patched the exploit backdoor that you could use.
You can flash/downgrade a PS3 to 3.55 with a E3 flasher, Progskeet or Teensy
E3 is the cheapest option, but not all console can be downgraded with it.
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