下载校验与命令行
MD5
8cc589baad3c80dd8324c37d7dc00750
SHA256
c3b82ba016c633bfe3b52b6758e3c208135c32bbd33c54790c84d37d21dee3e9
curl -O https://secure-appldnld.apple.com/iPhone4/061-7932.20100908.3fgt5/iPhone1,2_4.1_8B117_Restore.ipsw
# 校验文件完整性
md5sum iPhone1,2_4.1_8B117_Restore.ipsw # 期望 8cc589baad3c80dd8324c37d7dc00750