Yes! I got out of the 4.21-3.55.pup from rogero Rebug Thank you so much! Used 9.99 downgrader went to regero a2.7 3.55 and then to this new 3.55 from rebug! I would say it was very possible to downgrade from a higher ofw if you used this 999 downgrader.
To me this file was extremely helpful I didn't want to pay someone to flash it! Hopefully someone with a flasher would try this out and then we wouldn't need flashers it would be a completely software downgrade from any firmware Glory be to the hackers of PS3s!!!