You will first have to extract the firmware form the working unit. My understanding is that if the firmware is pre 9.x.xx you use a utility from S1mp3.org site (probably also available here), otherwise you need to look for s1fwx_v26_mympxplayer_org.zip on this site.
Once you have the firmware from the working unit you should be able to upgrade the firmware on the broken unit.
No guarantees though the risk is yours. Please confirm this info from another source on this site
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