Need some help downgrading from 4.89

Good afternoon, just a quick question. From the old guides I've seen about flashing using an e3 flasher, are those technique's still valid with ofw 4.89? Are the tools still safe to use and do I have to install rogero 3.55 or can I use 4.89 evilnat right off the bat?
And yes before you ask, I have checked which version ps3 I have and it is possible. Min OFW is 2.55.

Thanks!