Arduino UNO r3 "RX" led turns on when I connect reset and GND pin near the usb part to enter into dfu mode but when I lift off connection the arduino is showed in normal mode
Your topic has been moved. Please do not post in "Uncategorized"; see the sticky topics in Uncategorized - Arduino Forum.
As far as I know, you need to connect reset and GND before powering the board; next power up the board. Did you do that?
That's about all the help the I can provide.
This topic was automatically closed 180 days after the last reply. New replies are no longer allowed.