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Amazon.com: Yoneix 5V Micro USB Tiny AVR ISP ATtiny44 ATTiny45 ATTiny85 USBTinyISP Programmer Module for Arduino IDE Bootloader ISP Microcontroller(1PCS) : Electronics
GitHub - micronucleus/micronucleus: ATTiny usb bootloader with a strong emphasis on bootloader compactness.
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