Arduino clone avrdude: stk500_getsync() attempt 9 of 10: not in sync: resp=0x04 Hi firstly sorry for my english. I am using windows 10, IDE version 1.8.13. I sure for selected correct arduino(Arduino uno),port is correct, tried another cable. I uploaded sketch 3-5 times but after give this error. I using MAX7219 led matrix shield and shield is working and shown my lastest upload before error. Error:
avrdude: Version 6.3-20190619
         Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
         Copyright (c) 2007-2014 Joerg Wunsch

         System wide configuration file is &quot;C:\Program Files (x86)\Arduino\hardware\tools\avr/etc/avrdude.conf&quot;

         Using Port                    : COM6
         Using Programmer              : arduino
         Overriding Baud Rate          : 115200
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x04
avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0x00
avrdude: stk500_getsync() attempt 3 of 10: not in sync: resp=0x04
avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0x00
avrdude: stk500_getsync() attempt 5 of 10: not in sync: resp=0x04
avrdude: stk500_getsync() attempt 6 of 10: not in sync: resp=0x00
avrdude: stk500_getsync() attempt 7 of 10: not in sync: resp=0x04
avrdude: stk500_getsync() attempt 8 of 10: not in sync: resp=0x00
avrdude: stk500_getsync() attempt 9 of 10: not in sync: resp=0x04
avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0x00
Problem not solved, but I can program it with a USBASP programmer. I burned a bootloader, but the USB connection didn't work.
I am now using it without a bootloader.