Running Arduino Pro Mini on 8MHz with 3.3V or less

On the file boards.txt ({ARDUINO}/hardware/arduino/boards.txt) change this:

pro.menu.cpu.8MHzatmega328.bootloader.low_fuses=0xFF
pro.menu.cpu.8MHzatmega328.bootloader.high_fuses=0xDA
pro.menu.cpu.8MHzatmega328.bootloader.extended_fuses=0xFF

To this:

pro.menu.cpu.8MHzatmega328.bootloader.low_fuses=0xE2
pro.menu.cpu.8MHzatmega328.bootloader.high_fuses=0xDA
pro.menu.cpu.8MHzatmega328.bootloader.extended_fuses=0xFE

E2 will make it use the internal 8Mhz clock and

FE will make it change the brownout to 1.8V

Then use the bootload burner to burn the new fuses between with the bootloader.

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