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I have a problem with my Arduino Uno board, its not mounting in my linux machine but its power is On and L light is glowing. It was working before. After I tested buttons with 12V external supply. I am facing this scenario. I tried lsusb and i checked /dev/ ports also i couldn't find `ttyACM. I tried with another Arduino board and its working. I think the board is gone, I need help to fix this problem.

I thought its a bootloader problem I got new ATMEGA328p chip board is getting power on and L is blinking but port is not mounted I tried with lsusb and also ls /dev/ttyACM* with no result.

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You could try to flash the formware of the USB-Controller.

General steps for Arduino R3 are:

1.Put arduino in DFU mode (The R3 does NOT reqiure soldering for that)

2.flash the firmware using

dfu-programmer atmega16u2 erase
dfu-programmer atmega16u2 flash Arduino-usbserial-atmega16u2-Uno-Rev3.hex
dfu-programmer atmega16u2 reset

The package "dfu-programmer" is most likely available for your distribution.

If you have to build it from source because your dfu-programmer does not know the atmega16u2 yet, you will need to install libusb-dev (on debian-based systems).

Useful Links for that:

https://github.com/leocadiotine/Dvorany/wiki/Resetting-your-Uno-R3%27s-default-firmware http://arduino.cc/en/Hacking/DFUProgramming8U2

A useful search term for that is arduino r3 dfu-programmer

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