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The thing is, I already tried that once and not only did it send me back into a spiral of an unbootable system, it also messed up my working Unibeast stick (hence the need for a fresh one). That sounds like it should be easy: mount the EFI partition, delete the relevant folder, and then maybe replace it with one that you know works. However, I'm certain that I need to delete the existing Clover installation, remove it completely and do a fresh install. I could now try to reinstall the OS, or do a clean install onto my SSD. I've now got back to the stage where I can boot the system from a freshly made Sierra Unibeast USB stick.
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After much research and countless reboots, I've decided the problem was, and is, a corruption (or something) of Clover. I've been having serious problems with my system, which was running fine, but then became completely unbootable. Building a CustoMac Hackintosh: Buyer's Guide
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