Jailbreaking help?

Hello i was wondering if you could downgrade from 4.53 and jaibreak my ps3 if so can you tell how or give me a tutorial.

You can and it requires a E3 Flasher and the dismanteling of you PS3 first of all you need to check you CECH number with this list

I want to sell my ps3 on 4.50 DEX add me on skype yaqoobalvi

How much. I don't have skype