Hi all: Windows 7 32 bit, Arduino UNO R2 I had searched for a long time and I understand the standard procedure to put atmega 16u2 on UNO R2 into DFU mode. It was programmed by some other code by using usb-isp programmer. =( I short the reset pin like this: [image] And reconnect usb again, but…

Can not put Arduino UNO R2's atmega 16U2 into DFU mode

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