How to unlock the bootloader?

Using Arduino Avrdude, stk500, Bootloader issues
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how to unlock the bootloader to be able to reprogram the arduino microcontroller using some kind of software so that (arduino) is detected as a printer

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Please explain.

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@robertonavarro_24 see Unlock the bootloader

Are you and @VROM_03 the same person with 2 accounts ?

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