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Connect your iOS device to the computer using a high-quality USB-A to Lightning cable (USB-C to Lightning cables often fail to trigger DFU mode reliably).

tool via a bootable environment. This specific version (0.12.4) is notable for adding bug fixes for A9X devices and extending support for iOS 14.5.1. Key Components of the Package Checkra1n 0.12.4 ISO

Keep in mind that I'm providing general information, and it's essential to do your own research and exercise caution when working with jailbreak tools.