Sketch upload error: avrdude: stk500_getsync(): not in sync: resp=0x00

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hi there,

i have read lot of similar topics problem, none have helped.

i have tried different arduino board, different cable, have re-downloaded software , have re-installed drivers.

i used arduino uno smd, using arduino uno r3, uses atmega16u2.

i have double checked correct com port being used , correct board selected.

when usb connected arduino, "on" light appears on , light "l" next it. pressing reset button doesn't make lights blink used to.

up until week ago, previous board, working fine.

can me solution?

also, have tried "loop-back test". works supposed to.

after "loop-back test", attempted upload sketch again , received:

c:\program files\arduino\hardware\tools\avr\bin\avr-ar: unable rename 'core.a'; reason: file exists
binary sketch size: 3,578 bytes (of 32,256 byte maximum)
avrdude: stk500_getsync(): not in sync: resp=0x00


Arduino Forum > Using Arduino > Installation & Troubleshooting > Sketch upload error: avrdude: stk500_getsync(): not in sync: resp=0x00


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