RussC, First you need to download and install a few applications, here are the links:
http://www.mympxplayer.com/dload.php...le&file_id=136
http://www.mympxplayer.com/dload.php...file&file_id=2
Once installed you need to backup your firmware from your player to your PC using s1fwx. There is a tutorial on how to do that here:
http://www.mympxplayer.com/viewtopic.php?t=66
Once extracted put it somewhere safe as you may need it if you have problems.
To update the firmware on your player you need to use MP3 Update Tool which is part of the MP3 Player Utilities 3.68 that you downloaded. here is a tutorial on how to do this.
http://www.mympxplayer.com/viewtopic.php?t=46
You also need to be aware that upgrading your firmware is risky and an incompatible firmware upgrade could leave your player unusable. I do not mean to scare you and if your supplier is directing you to a particular firmware then you should be OK.
Hope this helps
Also let us know how it works out.