(adsbygoogle = window.adsbygoogle || []).push({}); Whit what thing i can downgrade my ps3? Only whit the E3 Flasher?

The E3 Flasher is the only option as up to now to downgrade your PS3. This requires to disassemble your PS3, install the E3, then reassemble your PS3.
Here is a tutorial how to do this:

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E3 isnt the only option but for people who have never jailbroken before its certainly the easiest method for downgrading compared to the other devices which still requires a certain level of difficulty to install depending on how intelligent you are in following instructions.