1 Key point/rule about firmware updates: Don't do it!
There is only 1 exception to that rule and that is, if you can extract your firmware without errors using s1fwx, you can update your players own firmware by theming it, changing the way it looks.
No matter what you think or have been told, a firmware 'update' will most likely do damage rather than fix. A firmware update will not magically give your player more capabilities, longer battery life, improve sound etc. There are too many different versions out there and you risk flashing the wrong version.. and that risk is very very high.
So just leave it alone.