psp location error

My psp is a psp1000 it did until last week have Devhook on it and I think Its regeon was left on chinese all the text and everthing is in english but I carnt now change this as it has 6.20 on it. Is there away to change this or do I need to somehow downgrade it and then devhook it and change it and then update it again. I would really like to use the comic book reader and it wont work until its in the correct regeon :( doah HELP HELP HELP HELP HELP HELP HELP HELP HELP HELP HELP HELP HELP HELP HELP HELP HELP HELP HELP HELP HELP HELP HELP HELP HELP HELP HELP HELP HELP HELP HELP :thumbup: