I have followed the instruction and at the stage of flashing testBuzzer, I come across a few errors. The serial monitor output looks like this: The baud rate is set to 115200 and No line ending is set. It compiles okay but I get this error when flashing. Arduino: 1.8.13 (Windows 10), Board: "Arduino Uno" Sketch uses 5362 bytes (16%) of program storage space. Maximum is 32256 bytes. Global variables use 328 bytes (16%) of dynamic memory, leaving 1720 bytes for local variables. Maximum is 2048 bytes. avrdude: stk500_paged_load(): (a) protocol error, expect=0x10, resp=0x61 avrdude: stk500_cmd(): programmer is out of sync avr_read(): error reading address 0x0000 read operation not supported for memory "flash" avrdude: failed to read all of flash memory, rc=-2 avrdude: stk500_disable(): protocol error, expect=0x14, resp=0xeb avrdude: stk500_disable(): protocol error, expect=0x14, resp=0xeb This report would have more information with "Show verbose output during compilation" option enabled in File -> Preferences. Any help will be much appreciated!