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Replying to @nakanaela

MattairTech has a 4k SAMD11 bootloader, which is like 1/4 of the Flash memory but gets it working with Arduino. For other projects (like cap touch experiments) I’ve been programming them directly with Atmel Studio and a J-Link. https://github.com/mattairtech/ArduinoCore-samd/tree/master/bootloaders/zero/binaries

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