Did you flash the XMOS or the MCU? Usually flashing the MCU incorrectly or partially causes the RGB lights to go dead.
If you experienced this issue after flashing the XMOS to v1.3, then @Eric68 may have to be notified.
Please provide photographs, steps to reproduce your problem.
After upgrade and restart my device, the ring starts to blink and the device didn’t initialize, more precisely, it was restarting.
I disconnected the power supply and the USB from the device for a while, then it initializes fine. After that, I restart the device several times, and everything was OK.
My device is a second generation with MCU updated previously.
Hi Shawn
I want to know what is the version of your Tone2 Pro before this situation.
More details : measured the level on the unbalanced headphones output, here are the value for test track:
Full volume level is the same between High Gain mode and Pre-Amp mode
Mid volume is different, higher on the Pre-Amp mode, so the decrease is not calculated the same way
It’s not a drama at all as we are not supposed to change setting on the fly, unless @Eric68 prefers both settings to match ?
P.S. : will the SPDIF output feature be included on a future firmware ?
Good suggestion, but the SPDIF OUT is bypass from ESS DAC from XMOS to Coaxial connector directly, not DAC volume not work for SPDIF OUT 
Edited:
It’s possible, what we should do might just release a new firmware and enable the XMOS software volume.
Hello, I also had the same problem, I was quite scared now everything works correctly, I observe that before you put the I2S power supply and it turned on directly and now you have to press the knob to turn it on, everything is perfect.
I have just updated the firmware on my Khadas Tone2 Pro Serial # 0CA10008, it is now no longer working; with the light under the wheel flashing on/off green.
It had been updated to v1.2 following the video instructions, and had been working fine.
If I try and re-load the file the DFU says no device is connected.
The only output is a ticking sound through my headphone amp.
Any help would be much appreciated.
Hey @patl2020, did you tried to follow the steps mentioned by @Ardummy?
Basically:
These steps worked for me and Ardummy also.
hi, I have just done that and yes pulling out the USB cables and then re-starting everything worked.
Thanks so much
Worked perfectly! Thanks!
Initially the new features did not appear - then I remember to restart the device and now I am controlling my amp from my desk instead of having to reach for the remote!!
It also seems to keep the MQA mode: at least the colors still show at the wheel. I will try to run an oscilloscope check when I can (typically next week) to see the beyond-44khz content.
So I guess that’s it. It’s dead and there’s no more help coming.
Great. Mine died too
When I updated mine I had power plugged in the 2nd USB slot and a data USB lead connected to Windows 10.
Once it had updated (successfully) it started slowly flashing green on/off but Windows would not connect to it and no amount of pressing/turning the Tone 2 wheel made any difference.
But I got control back once I removed the power lead from the 2nd USB slot on the Tone 2 and held the wheel in for a few seconds to ‘re-boot’ it and rebooted Windows.
I checked it out by only connecting with the USB data cable.
I don’t know if this helps but fingers crossed.
Mine worked well on Windows10 after updating, but I did the update on Windows7, and it was easier to see that after the update was done, Windows was seeing the Tone2 Pro as a new device and so was installing again several drivers. It took at least 3 minutes, and then asked to reboot the computer.
I never touched the Tone2 Pro during this time, and once computer reboot was done, everything was working perfectly.
So, even on Windows10, better be patient, check on the right panel the message to confirm that Windows has re-installed the drivers, and then do a reboot.
Hey @Shawn_O, did you tried to follow the instructions that we mentioned before, my device also “died”, but I could conclude the firmware update after some steps 
.
These are the steps that worked for most of us:
I hope that these steps can help you!
Yes, I did. How long should I hold the Knob? I tried 30 seconds and got depressed. DOES NOT WORK.
I’ll post screenshots … ST-Link Tool and Set up.
T
Not connected.
Hi @Shawn_O,
Thanks for the new try, I will let our sales to contact you for after sales service.
Sorry again for the inconvenience!
