AVR upload errors

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i have tried using arduino unos program engineering project 4 boards have gotten either error avrdude: stk500_getsync(): not in sync: resp=0xe0 or avrdude: verification error; content mismatch. have no idea why these errors come up. confident didnt burn out 4 different boards , since uploading same sketches when worked when didnt work dont see why these errors coming up. have legitimate solution solve either of these 2 upload errors.


do have correct board selected on tools menu?


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