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32-bit avrdude will cease to function on macOS 10.15 · Issue #147 · platformio/platform-atmelavr · GitHub
avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0x00 avrdude: stk5 - Avrdude, stk500, Bootloader issues - Arduino Forum
AVRDUDE | USBtinyISP | Adafruit Learning System
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AVR Tutorial - Software setup for Mac OS X
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GitHub - svendahlstrand/hello-avrdude: 🔬 Get started with the AVR toolchain and AVRDUDE on macOS.
AVR Tutorial - Software setup for Mac OS X
Latest Arduino (1.8.10) cannot program 32u4-based boards under Catalina (Rel. 10.15 Build 19A583) · Issue #9290 · arduino/Arduino · GitHub
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AVR Tools
Arduino Eclipse Development Environment for Mac OS X | Mechatronics Project Site
avrdude: ser_open(): can't open device "unknown": No such file or directory - Installation & Troubleshooting - Arduino Forum
