System updates resolve rare digital signal processing (DSP) glitches. Updates prevent sudden audio drops when switching between Dolby Digital and DTS soundtracks. They also fix system freezes during long operation hours. Pre-Update Checklist: Preparing Your Receiver
: Use a standard USB drive formatted strictly to FAT16 or FAT32 . denon avrx520bt firmware update top
Caution: Do not turn off the receiver, unplug the USB drive, or press any buttons while the update is in progress. The update can take anywhere from 10 to 30 minutes. Step 5: Completion System updates resolve rare digital signal processing (DSP)
If you bought a refurbished unit or haven’t updated in 18+ months, your receiver might fail HDMI 2.0b handshakes with newer TVs (LG C2/C3, Sony A95L). A "top" update restores compliance with HDCP 2.3. unplug the USB drive