Assuming that you check minver by using PUP, and result is 3.20. Then you should use NOR patcher. BTW. Don't follow any steps when you are not even sure what console/memory chip type you have. Is easiest way to brick.
Here are some tips: ** http://www.**ps3xploit.com >Doma...y team** (ps3xploit.me =new)/help/writer.html