Optiboot (an older version) is installed by default on the Arduino Uno and (as of 2018) official Arduino Nano boards. It can be installed on all older mega8, 168 or 328 based Arduinos. As of 2019, ...
Based on optiboot, works with CV520 and MFRC522. Check optiboot.c#722 for actual differences between normal UART bootloader and this MFRC522 NFC bootloader. Because sometimes you don't have physical ...
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