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I have a Arduino Leonardo board. and i get an error : avrdude: stk500_getsync(): not in sync: resp: resp=0X54

I have downloaded the Arduino environment from here. I am on my Mac.

I selected the Arduino Board as Arduino UNO, and the serial Port as /dev/tty.usbmodemfd121 and when i click on the upload button i get the error message avrdude: stk500_getsync(): not in sync: resp: resp=0X54.

When I click on the reset button, and click on Upload, I get a popup window that says Serial port /dev/tty.usbmodemfd121 not found. Retry the upload with another serial port.

and in the list of serial ports, i have

/dev/tty.Bluetooth-Modem
/dev/cu.Bluetooth-modem
/dev/tty.iphone-wirelessiAP
/dev/cu.iphone-wirelessiAP
/dev/tty.Bluetooth-PDA-Sync
/dev/cu.Bluetooth-PDA-Sync

What should i do to run my Hello World code ?

UPDATE

Binary sketch size: 4,858 bytes (of a 28,672 byte maximum)
Found programmer: Id = "B¯˜"; type = 
 Software Version = 
avrdude: error: buffered memory access not supported. Maybe it isn't a butterfly/AVR109 but a AVR910 device?
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    \$\begingroup\$ Why are you selecting Arduino UNO when you are using a Leonardo? The third sentence in the link you provided states, "you must choose Arduino Leonardo from the Tools > Board menu in the Arduino IDE" \$\endgroup\$ Aug 29 '12 at 14:08
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    \$\begingroup\$ There is no Arduino Leonardo in the > Tools. \$\endgroup\$
    – illep
    Aug 29 '12 at 14:34
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    \$\begingroup\$ Which version of the IDE do you have? You need 1.0.1 for it to work properly with the Leonardo. See here Reply #6 in particular. But read the whole thread as it seems similar to your problem. \$\endgroup\$ Aug 29 '12 at 15:01
  • \$\begingroup\$ Yes, Thank you for that, i missed it. But, i am unable to upload the Blink code to the board. It says Uploading... nearly for 3 mins, and then printed an error message which i have added it as an Update in the post above. \$\endgroup\$
    – illep
    Aug 29 '12 at 16:05
  • \$\begingroup\$ Did you try reburning the firmware as talked about in Reply #3 in the above link? Or are you by chance using a USB 3.0 port as was the problem here? \$\endgroup\$ Aug 29 '12 at 17:19
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Things to check:

  1. Are you running version 1.0.1 of the IDE? It is required to interface to the Leonardo. See Reply #6 from this thread in the Arduino forum.
  2. Have you reburned the firmware for the Leonardo? See Reply #3 from the above mentioned thread.
  3. Are you using a USB 3.0 interface? If so, using a USB 2.0 cable in a USB 3.0 interface has been known to cause issues. See this thread from Adafruit.
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