Arduino: Restore Arduino UNO bootloader using avr dragon

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Revision as of 21:40, 13 February 2016 by Lukas Dzunko (talk | contribs) (→‎Step 1)

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If you "play" a lot with Arduino UNO then you may end up with locked up device or broken boot loader. There is way out of this problem but you will need additional device. I am using avr dragon for ISP programming and following commands can be used to restore Arduino UNO boot loader.

Note: This work also for other Atmel based devices but configuration needs to be modified accordingly.

Step 1

Download optiboot_atmega328.hex from optiboot at github.

Step 2

Erase chip: 

sudo avrdude -p m328p -c dragon_isp -P usb -e

Step 3

Configure fuse and lock bits: 

sudo avrdude -p m328p -c dragon_isp -P usb    -u -U lfuse:w:0xff:m -U hfuse:w:0xde:m -U efuse:w:0x05:m -U lock:w:0x3f:m

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