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GitHub - 74hc595/PIC16F1-USB-Bootloader: A tiny USB CDC bootloader for PIC16F1454/5/9 microcontrollers
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nRF52840 USB Key with TinyUF2 Bootloader - Bluetooth Low Energy [MDBT50Q-RX] : ID 5199 : $15.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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