Upload fails: "avrdude: stk500_getsync() attempt 1 of 10: not in sync"

Why this error it worked fine for few days now this issue is showing for no reason, m getting serial data when connecting, and its verifying without error but its not getting compiled to the board...below is the error message.
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x00
avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0x00
avrdude: stk500_getsync() attempt 3 of 10: not in sync: resp=0x00
avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0x00
avrdude: stk500_getsync() attempt 5 of 10: not in sync: resp=0x00
avrdude: stk500_getsync() attempt 6 of 10: not in sync: resp=0x00
avrdude: stk500_getsync() attempt 7 of 10: not in sync: resp=0x00
avrdude: stk500_getsync() attempt 8 of 10: not in sync: resp=0x00
avrdude: stk500_getsync() attempt 9 of 10: not in sync: resp=0x00
avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0x00
Failed uploading: uploading error: exit status 1

посмотри "инструменты" => "processor: возможно проблема там. у меня было такое. подключал Arduino NANO. Начала работать от параметра ATmega 328P (Old bootloader).
Стандартная ошибка загрузчика проверь на другом загрузчике.

Go to the tools menu and select the correct board. With all of the information given I cannot give a better answer. What Arduino would help. What IDE would help, ..etc.

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