Based on Denon’s official release notes (and confirmed by user reports across AV forums), the latest firmware (check your unit) addresses:
: Improves pairing reliability and reduces audio dropouts when streaming from newer smartphones. System Hangs denon avr x250bt firmware update fixed
If the unit becomes unresponsive, perform a microprocessor reset. Turn off the device, hold down the Tuner Preset CH + and Tuner Preset CH - buttons on the front panel, and press the Power button until the display flashes at 1-second intervals. Try the update process again after the reset. Based on Denon’s official release notes (and confirmed
If the display is stuck on "Update" and will not respond to buttons or remote commands, the firmware may have corrupted the bootloader. In this scenario, there is no "magic" user fix. You will need to contact Denon support or an authorized repair center to have the firmware flashed via the service port. Try the update process again after the reset
like HDMI dropouts or Bluetooth pairing failures that you hope an update will resolve? AVR - Check for the latest firmware version - Find Answers
Unlike higher-end models in the X-Series (such as the X1500H and above), the AVR-X250BT
⚠️ Do not unplug, press power, or switch inputs during the update. A failed update can brick the receiver.