lincolnwang

you can also put Teensy into 'original' state by pressing the program button until red light shows up (around 15 s). you release the program button and teensy wipes out all memory and installs original blink program.

Sorry for the confusion, I meant the GPIO from a single board computer that runs the uploading program.

I see. So when we integrate Teensy into an embedded system and attempt to upload firmware update to it remotely, we will have to connect the PROGRAM pin to a GPIO so the host can control it in case of flash memory corruption. Make sense?

Hi, I have a Teensy 4.1 was unplugged during code uploading. When it is plugged again, I can see the RED LED is having a 4 quick blink pattern. According to Paul here, it indicates failure with the flash memory chip. Normally when I upload...