：现代iPhone（特别是iPhone XR及之后的机型）采用了A12及以上芯片，苹果早已修复了底层BootROM漏洞。没有BootROM漏洞，定制IPSW根本无法通过签名验证。即便你在少数老旧机型上成功，也往往面临基带失效、信号丢失或无蜂窝网络的问题。
The Reality of Custom IPSW iCloud Unlock Tools: Myth vs. Method custom ipsw icloud unlock top
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好消息是，开源社区已经开发出了许多利用软件漏洞或高级恢复模式的现代安全工具。相较于改IPSW，这些工具往往更智能： or pre-install jailbreak tools.
If you have an iPhone 5s, 6, 6 Plus, or iPad Air 1/Mini 2/3 running specific old iOS versions, this method is a "long review" because it involves a complex, often frustrating journey into the legacy side of iOS modding.
A modified version of this official firmware, altered to change system behaviors, bypass restrictions, or pre-install jailbreak tools.