Current firmware for RDR55D (old Audio FDA20): RDR55DV514.ZIP

Current firmware for RDR55E (new Audio FDA21): RDR55EV514.ZIP

Contains configurations (German, English, North-American) and dedicated tasks for RDR55D/E with built-in RDR35 module. Not suitable for devices with RDR25 module!!

Please check receivers version (D or E) by recognizing version of audio module (20 or 21) only! Upgraded receivers may be labeled version D on frontside or backside label but have already installed the new audio module FDA21!

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Previous firmware for the RDR55D: RDR55DV508.ZIP

Contains configurations RDR55DV508 to RDR55DV609 for all devices RDR55D with built-in RDR35 module. Not suitable for devices with RDR25 module!!

Also inculded is an audio task of the FDA20FS module for surround sound of the time based demodulators.