While Denon does not frequently release public firmware changelogs for this specific non-networked model, the following common issues are known to be addressed by system-level resets or internal firmware revisions:
(or your regional Denon site) to check if a newer firmware version is available for the AVR-X250BT denon avr x250bt firmware update fixed
Press and hold the and Tuner Preset Ch - buttons together. Press the Power button while holding those two buttons. While Denon does not frequently release public firmware
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