Installing macOS Big Sur on an unsupported Mac involves using tools like OpenCore Legacy Patcher to bypass Apple’s hardware restrictions. The process typically includes creating a bootable USB installer, modifying system boot settings, and applying post-install patches to enable proper hardware functionality such as graphics and Wi-Fi. While this extends the usable life of older Macs, it carries risks including reduced performance, potential system instability, and lack of official updates, so careful backup and compatibility checks are essential before proceeding.

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