Search for Yifanlu's threads about updating the KDX to 3.x firmware. There, Yifanlu also published notes and stuff about a rescue system for the KDX. You can use this plus the migration software (to 3.x firmware) on the KDX in order to backup one KDX, migrate the backup files to the other and recover from the backup files. Be careful, read enough to understand what you're doing.
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