https://ios.gadgethacks.com/how-to/download-install-ios-12-gm-golden-master-your-iphone-0187347/
¿©±â¼ Àڱ⠸𵨿¡ ¸Â°Ô ´Ù¿îÀ» ¹Þ°í,
¾ÆÀÌƪÁî¿¡¼ shift Å°¸¦ ´©¸£°í ¾÷µ¥ÀÌÆ® È®ÀÎÀ» ´©¸¥ ÈÄ¿¡
´Ù¿î ¹ÞÀº ¸ðµ¨ IPSW¸¦ ¼±ÅÃÇØÁÖ¸é µË´Ï´Ù.
»ç¿ëÈıâ
http://viewingcat.tistory.com/723
https://m.blog.naver.com/saj04204/221311959249