Same issue here. Have original Chime and it just stopped working. Went through all the steps in this forum and even called tech support. They had me plug it in upside down and repeat reset attempts… didn’t work.
I was told it was out of warranty so I am out of luck… too bad, not our fault, there is nothing we can do.
I asked if they knew what the problem was that all these Chimes were bricking, and was told they had no idea. I understand if the device fails under normal use, but for all these Chimes to be “functional” but not able to reset sounds to me like a pushed firmware issue, or a board failure.