I am attempting to run the “factory reset” sequence for the DUO described here: OnlyKey DUO User's Guide | Docs
That procedure is, as I understand it: hold down #1 for 10 seconds (flash red), then hold down #2 for 20 seconds.
When I hold down #1 for 10 seconds, it does not flash red. Instead, I get a single yellow blink, as if it registered as a single tap.
I was able to perform the factory reset once on this unit. Subsequent attempts have failed.