how to download ipsw files original iphone sign firmware on Windows pc

以下是Apple iOS 8 作業系統，各機種韌體 iPSW 版本直接下載位置列表，不想等 OTA 更新出來，想快點升級的朋友們請自行下載，然後在電腦上使用它來更新機器。

Download current and previous versions of Apple's iOS, iPadOS, watchOS, tvOS, audioOS and macOS firmware and receive notifications when new firmwares are released.

Download iOS and iPadOS 8.1 IPSW firmware files free directly from the Apple server

Download the latest iOS firmware (IPSW) for iPhone. Access signed and unsigned versions for iPhone8,1.

Select and download signed or unsigned iPhone8,1 IPSW firmware. Signed IPSWs can be restored via iTunes, while unsigned IPSWs require alternative restore methods.

经过两周时间的测试，今日苹果正式推送iOS8.1.1更新，该版本着重对iPad2以及iPhone4S等老设备进行了性能上的优化。 IT之家也在第一时间为大家带来了iOS8.1.1固件官方下载大全，供有需要的朋友参看。