![Latest Arduino (1.8.10) cannot program 32u4-based boards under Catalina (Rel. 10.15 Build 19A583) · Issue #9290 · arduino/Arduino · GitHub Latest Arduino (1.8.10) cannot program 32u4-based boards under Catalina (Rel. 10.15 Build 19A583) · Issue #9290 · arduino/Arduino · GitHub](https://user-images.githubusercontent.com/37643433/70659180-28142d00-1c25-11ea-961e-6d1db754d477.png)
Latest Arduino (1.8.10) cannot program 32u4-based boards under Catalina (Rel. 10.15 Build 19A583) · Issue #9290 · arduino/Arduino · GitHub
![avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0x00 avrdude: stk5 - Avrdude, stk500, Bootloader issues - Arduino Forum avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0x00 avrdude: stk5 - Avrdude, stk500, Bootloader issues - Arduino Forum](https://aws1.discourse-cdn.com/arduino/original/3X/8/0/805619840edb5c6d3d26c9c6e0cf1bb51168f1b5.png)
avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0x00 avrdude: stk5 - Avrdude, stk500, Bootloader issues - Arduino Forum
32-bit avrdude will cease to function on macOS 10.15 · Issue #147 · platformio/platform-atmelavr · GitHub
![Latest Arduino (1.8.10) cannot program 32u4-based boards under Catalina (Rel. 10.15 Build 19A583) · Issue #9290 · arduino/Arduino · GitHub Latest Arduino (1.8.10) cannot program 32u4-based boards under Catalina (Rel. 10.15 Build 19A583) · Issue #9290 · arduino/Arduino · GitHub](https://user-images.githubusercontent.com/37643433/70665993-5c8ee580-1c33-11ea-9c2a-752f945bad59.png)