Maybe
Igorsk's Flasher for the 500 is what you need. Maybe it contains a copy of the old firmware.
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So here it is. From the readme:
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This set of scripts allows to flash a custom image or replace any files inside
the /opt directory of the Reader filesystem using just a flash card. The /opt
directory contains the main Reader UI and supporting files.
Possible uses include:
1) rolling back to an older firmware version
2) customizing the UI look and behavior
3) replacing/adding built-in fonts
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As an example, provided xml files add a configurable clock display in the
status bar of the navigation menus and book reader.
Version 1.2: support for firmware version 1.0.02.01300
Version 2.1 with support for firmware version 1.0.03.07170.
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