<p><span style="color: #404040; font-family: 굴림;">아두이노 1.6.5 이상에서 부트로더 업로드시 아래 에러 발생.&nbsp;</span><br style="color: #404040; font-family: 굴림;" /><span style="color: #404040; font-family: 굴림;">&nbsp;***failed;&nbsp;&nbsp;</span><br style="color: #404040; font-family: 굴림;" /><span style="color: #404040; font-family: 굴림;">avrdude: WARNING: invalid value for unused bits in fuse "efuse", should be set to 1 according to datasheet&nbsp;</span><br style="color: #404040; font-family: 굴림;" /><span style="color: #404040; font-family: 굴림;">This behaviour is deprecated and will result in an error in future version&nbsp;</span><br style="color: #404040; font-family: 굴림;" /><span style="color: #404040; font-family: 굴림;">You probably want to use 0xfd instead of 0x05 (double check with your datasheet first).&nbsp;</span><br style="color: #404040; font-family: 굴림;" /><br style="color: #404040; font-family: 굴림;" /><span style="color: #404040; font-family: 굴림;">---&gt; 아두이노폴더 &gt; hardware &gt; arduino &gt; avr &gt; boards.txt 에서&nbsp;</span><br style="color: #404040; font-family: 굴림;" /><br style="color: #404040; font-family: 굴림;" /><span style="color: #404040; font-family: 굴림;">uno.bootloader.extended_fuses=0x05 --- &gt; 0xFD로 수정</span></p>