iOS 11.2.1 - 15K152 stopped being signed for 1 device
iOS 11.2 - 15K106 stopped being signed for 1 device
iOS 11.2.2 - 15C202 stopped being signed for 41 devices
iOS 11.2.1 - 15C153 stopped being signed for 41 devices
iOS 11.2 - 15C114 stopped being signed for 36 devices
可能是因為這幾天藍牙漏洞被公開
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6點半時一次關三個版本,現在只能升iOS 11.2.5了