Hi, From what I have experienced and read, it seems that the bootloader needs around 10 seconds before it will boot into the application in flash. Sending any data (serial) will make the bootloader not boot into the application at all. Is there any command I could send to the bootloader during th…

Force bootloader to start application

Robin2 July 18, 2018, 9:16am 4

IMHO it would still be wise for the PC to wait until it has evidence that the Arduino is ready.

...R