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See What happens when code is uploaded using the bootloader? What happens when code is uploaded using the bootloader? - the flashing is by design.

Optiboot flashing pin 13

Probably the reason is to confirm that the bootloader has started.

See What happens when code is uploaded using the bootloader? - the flashing is by design.

Optiboot flashing pin 13

Probably the reason is to confirm that the bootloader has started.

See What happens when code is uploaded using the bootloader? - the flashing is by design.

Optiboot flashing pin 13

Probably the reason is to confirm that the bootloader has started.

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Nick Gammon
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See What happens when code is uploaded using the bootloader? - the flashing is by design.

Optiboot flashing pin 13

Probably the reason is to confirm that the bootloader has started.

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