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I ran a couple quick tests, with this code.



void setup() {
pinMode(2, OUTPUT);
}

void loop() {
noInterrupts();

Any chance you could try again with that cable. You said there was no red LED. But with a charge only cable, the red LED is supposed to blink after you've pressed the button. The red is **NOT**...

Something is very wrong. Pretty the button on Teensy 4.0 should always cause it to go into bootloader mode, turning on the red LED.

But from the log file, this looks rather disturbing:



I'm...

The red LED means Teensy is in programming mode. It's dim while waiting for communication from your PC. It's bright red while actually writing data into the flash memory. When Teensy Loader runs...