(adsbygoogle = window.adsbygoogle || []).push({}); So I have a Slim PS3 that I'm downgrading with a E3 Flasher, and the PS3 is on 4.66 OFW. Do I patch it with the 4.66 patch tool or 4.55 patch tool?

Have you made sure that the PS3 can be downgraded?

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Get PS3 Nor and Nand Auto Patcher v4.66 By darkjiros.

Patch it then install 4.66 Ferrox v1.00 or Darknet 4.66 v1.00

After install use 999 downgrader to get to a lower cfw.