Originally posted by jambalaia00
How do I downgrade OFW 3.41 to 3.55 ?
You don't downgrade it as you are below the firmware. Therefore, you have to upgrade it.
Download the 3.55 OFW, place it on your USB, then head to "Update from Storage Media" on your PS3.
Make sure it's 3.55, if you update past 3.55 then you are fucked. After you are on 3.55 OFW, download your desired CFW and then enjoy.