RussC, First thing you may need to do is Register as a Member then you will be able to reply to posts. You will find a shortcut to Register under the mympxplayer.com banner at the top of the page.
Then once registered Download s1fwx from
HERE
Then follow this guide to copy your firmware to your PC
HERE
Now that you are registered you will be able to reply to this post. Let me know your progress and I will walk you through the next step.