Looking at eeprom.c this is the line that generates that error message.
https://github.com/PaulStoffregen/cores/blob/3c442f9c67ee785ddad921ff5d0a3ebe5a9682ca/teensy4/eeprom.c#L53
Looks like you want to set it to 3824....
Right, the button shorts (to GND) the trace that the program pin is connected to, so pressing the button and shorting the program pin to GND do the same thing. A quick press will put the Teensy into programming mode...
No worries, I would hope it was just a strange accident that it was pressed between 13-17 seconds and not that something shorted the program pin for that amount of time.
The Teensy has a LED Blink restore feature if you hold the program button down between 13 and 17 seconds. Is there a chance that this happened? It would also happen if the program pin was pulled low for this time...
I have been using this library ever since our last message and everything has been pretty smooth so far. I did find one issue today when testing client reconnection, if you unplug and plug back in the ethernet cable...
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