Re-Flashing atmega328p with Arduino as an ISP

hi, need re-flash arduino bootloader set minimal config run in 8mhz internal clock, have installed 16mhz external clock bootloader following below given link, consumes more power decided re-flash minimal config how this, brick mc if follow same tutorial , install 8mhz clock or other way it, please share details urgent.

https://www.arduino.cc/en/tutorial/arduinotobreadboard

you must take great care when flashing new fuses (for 8mhz internal clock). once you're done that, can safely flash new bootloader.

here's advice on how set fuses:

http://www.ladyada.net/learn/avr/fuses.html

i figure, however, proper fuses 8mhz internal clock, , else remaing default arduino are:

low = 0xe2
high = 0xde
ext. = 0x05

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