下载校验与命令行
MD5
ca59a7f63377d058493e2a7fa8ca3425
SHA256
c2f40a6cb667cae9e8328ac3c35cd1a0ffefcf6ed31826c6b84af53b99250897
curl -O http://appldnld.apple.com/ios11.0/091-31833-201700919-35ACC09E-9027-11E7-A152-3335B64D2808/iPhone_4.7_11.0_15A372_Restore.ipsw
# 校验文件完整性
md5sum iPhone_4.7_11.0_15A372_Restore.ipsw # 期望 ca59a7f63377d058493e2a7fa8ca3425