A very peculiar and interesting thing with my denon. I don't know whether it's due to any lack of oversight.....or any misdiagnosis.
So what happened is this:
2 months back, my denon again started having the issue as mentioned in the OP. I was flabbergasted. I tried the usual troubleshooting......still error.
Then I resorted to the USB update route
again. Didn't work this time. I got very pissed off.....such software bugs and OTA updates messing up again and again. I said enough I am not going to do anything.....and keep the AVR as a paperweight.
I kept it just like that for almost 2 months.
My Sabaj D5 + Kali LP8 + Klipsch subwoofer is so good.....I thought let the denon be relegated to the dustbin. I couldn't find any rationale to send the device to get it repaired spending around 28k (which was quoted to me way back as mentioned in my OP)
Then last week I was doing some finishing touches with my dedicated HT......dark colours walls, heavy blackout curtains to cover windows and acoustic treatment...with a final placement of my motorised recliners.
I thought of just playing with my denon x2500h and see if I can use the AUX function.
I turned on power.....and surprised by no display of error. I thought "What the......no update error? No please wait". I was not really convince that it might work again. I turn off and power on again…….and yes, the device didn’t show any update error. But the initial display did showed “HDMI=NONE”
This left me thinking……and a remote possibility that the device ‘might’ work …..rekindle some hope in me. So just for namesake I tried the rest steps - press the Tuner + and Tuner - keys when powering on. I was not expecting much…..
but the device showed no error again. It showed ‘Initialised’ and the a normal display. (But still no display output on my TV)
I didn’t know what to do next. I expected the usb update to work. I expected the display output to work after resetting. But nothing …..powered up gain the initial display showed ‘ HDMI = NONE’. No buttons on the remote was working….cannot go into setup/settings.
I fiddle with the input selector (the right knob) ….and somehow dialed into the ‘TV AUDIO’ selection.
Then
Set up started. I stared at the device for 2 minutes
I had disconnected my TV……now with some excitement I connected again and VIOLA the display output worked…..the setup assistant came up. I connected my speakers LR and competed the setup. The remote buttons worked and setup can be
now entered.
I checked all my settings. Disabled auto update. Luckily I saw the newer firmware (not the original factory one, which I also had on usb) with latest DTS version.
Okay now my moot point:
Dear FMs, if your denon issues especially with update error comes up….power off and shelve the device for few days or weeks. And then retry resetting. And see if you can get the setup assistant work again.
I don’t know how these bugs and errors are resolving themselves…..but one guess is that there could be a profile setting on ? EPROM …..possibly after some days with power off, it resets or something. I definitely remember getting update errors…errors numbers of 2A02…or 2B02 codes. I also remembered the sickening feeling after the failed troubleshooting.
But all ends well that ends well I supposed.
Currently I use the multiple HDMI inputs on my TV/PROJECTOR and use HDMI/ARC with the AVR.
Sharing this intriguing experience.