Never update during a thunderstorm, never power off mid-update, and always reset after a USB flash.
The simplest path using a hardwired internet connection. denon avr x4000 firmware update upd
: If the unit hangs, hold the Power button on the AVR itself (not the remote) for 5 seconds to force a reboot. Never update during a thunderstorm, never power off
This often breaks native features like older Spotify implementations, though basic streaming via external devices still works fine. How to Update (The Workarounds) Never update during a thunderstorm
Use this method if the network update fails or if your unit is stuck in a loop.