To help with your last point as you sound like you are now out of warranty. Get a spray can of Electrical Cleaner and a QUICK squirt using the straw will have it up and running again. And if you still have the old one you will now have two.
Sounds similar to another issue I just commented on. If the Epson instructions are before the Sony move the Sony ones to before the Epson, if it now works look for errors in the Epson instructions. Sadly If an Activity fails part way through it doesn't tell you.
Had the same thing, too long ago to remember it exactly. The difference is a Device is a single item an Activity is a set of instructions that control multiple Devices and runs in order. The problem is that if one instruction is not programmed properly the activity just stops with no warning to say it's failed. To test this move all the Onkyo instructions to the beginning of the Activity and if it now turns on the error is in the Device that was before it.
If the only issue with using the XW6000ES codes is the power button then this is user error as there is no Power Button on the remote. The Off button on the remote turns off an entire Activity and has no function on individual devices. If you really need an off button for an individual device you need to program one of the buttons below the screen on the remote to do it or add it to favourites. Or if you are not going to use Activities buy the U1 or U2.
@dvdmd1. Please explain what you mean by "fix". What is yours doing or not doing? My Apple TV 4K long press of the ok button works exactly the same as the original remote.
@DickM. This thread has been discussing the fact that Sofabaton removed the LONG PRESS option on some buttons (Direction, Volume, Channel & Mute) not the operation of the Mute button itself. If you are having problems with Mute itself that is a different issue and it may be worth starting a new thread. But on my X1 the Mute button itself works as it should (press to Mute, press again to unmute).
@DickM
I think you misunderstand the issue.
Muting works as it should (and as you describe) but in an older version of the app you could assign a LONG press of the Mute button to something else. I used it to change the Picture mode on my TV.
I am now using a beta version of the app that has had all the Long Press options reinstated.
I really should have read the subject line and not just your last post I would than have known you had a U1, which I don't own and know very little about.