(adsbygoogle = window.adsbygoogle || []).push({}); im a new to all this btw . right now im on 4.55 ofw.

What version is the fat on?
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If you are on 3.55+, you will need a E3 flasher to downgrade the PS3. There are tutorials on NGU on how to downgrade and stuff :p

i have an e3 flasher and right now im on 4.55 ofw. i know how to do a slim but i dont know if its the same way.

yea i can downgrade to 2.50. i have all the suff downloaded that i need unless i need something different . i just need to know how to take it apart an do i do something with the hdd ? i seen i people putting it in the box type thing that comes with the e3 but idk if i need to install something it it or what .

You don't need the HDD connected while downgrading with the e3 flasher. But, you haven't answered the question " what model number your PS3?"
Reason being not all FATS have NOR chip and the e3 flasher is only compatible with only NOR PS3s.

If you need help taking the Ps3 apart there are many youtube videos on how to open the ps3. Also, many videos on how to use the e3 flasher.