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I have a CECH-3003A 160GB Slim PS3. Is this compatible with the E3 flasher? As the tables stating what's compatible make no sense to me.

Secondly where can I buy an E3 flasher, and will it allow me to downgrade from 4.30OFW which I'm on now to a CFW?

Thank you.

EDIT: Ran that .pup that checks the version your PS3 came with, mine was 3.66.
Can I still go to 3.55 as the minimum was 3.66, or is it better to go to say 4.21CFW?

3k models are not downgradeable.

If you checked and the lowest is 3.66 then you cannot downgrade to 3.55 and is 3.66 even a firmware?

Im sorry bro but as of now you would need to go to 3.55 cfw to install a newer firmware 4.21cfw.

nope your stuck at OFW for now and probably for a while longer i suspect all 3000 & 4000 models cannot be downgraded as they where released after 3.55 firmware and had new things added in the hardware to "secure" them again just wait and see what happens all i ca say really.