Arduino uno constantly re-booting cu.usbmodem14201": Resource busy

Development Tools IDE 1.x
1

Hi all,

I'm new to arduino and i'm having truble uploading, it's works like 1 out of 5 tries. Also when the board is connected to my Macbook Pro (running Mojave), it look like it's constantly re-booting. Every thing is just fine when i power the board from an external power source.

Here is the message when upload is failing:
Arduino: 1.8.9 (Mac OS X), Board: "Arduino/Genuino Uno"

Sketch uses 930 bytes (2%) of program storage space. Maximum is 32256 bytes.
Global variables use 9 bytes (0%) of dynamic memory, leaving 2039 bytes for local variables. Maximum is 2048 bytes.
avrdude: ser_open(): can't open device "/dev/cu.usbmodem14201": Resource busy

Does someone have a clue how to fix it?

Thanks a lot :slight_smile:
P.S. The Loop-Back test works once i managed to get connected (average one of 5 tries)

2

Do you have any shield, external circuitry, or components attached to your Uno? If so, try removing everything and using just the Uno alone to see if that makes the problem go away.

3

Even with nothing attached to the arduino uno it's the same thing :frowning:

4

Have you anything else connected to the computer USB?
Disconnect everything from the PC, restart it . Connect your bare Arduino and try to upload the Blink sketch .

Is it a genuine Arduino ?