Bootloader Atmega 32u4

Hello,

I am trying to put this Arduino board into bootloader mode, but I can't find how to do it.

My product :

Do you have a solution?

Best regards

Hi @madzee939. You can do it by momentarily connecting and disconnecting the RST pin to the GND pin on the Pro Micro board twice. This can be done with a wire or metal tweezers.

Depending on which bootloader the manufacturer installed on the board, it might only stay in the bootloader mode for a matter of seconds before switching back to running the sketch program again.

Are you asking about this because you are having trouble uploading a new sketch to the board? Normally the Arduino development software will automatically put the board into bootloader mode (it can be done via software in addition to the reset pin technique) at the right time during the upload, so normally we don't need to think about this at all. However, in some cases the behavior of the sketch program might make it so that the automatic bootloader mode activation is necessary, so it is sometimes necessary to manually activate the bootloader mode during the upload. If so, I can provide more detailed instructions for doing so if needed.

Thank you very much, you have solved my problem. Best wishes.

You are welcome. I'm glad if I was able to be of assistance.

Regards,
Per