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Click EFI>EFI>CLOVER and Right click>Compress CLOVER >upload to the Forum using its button to browse to source of the file and upload.Dark icon of EFI partition of your El Capitan disk will appear on the Desktop.Right to the above click on "Mount Partition".
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Yes, you can upgrade El Capitan to High Sierra if the hardware in your profile is what you want to upgrade from El Capitan to MacOS High Sierra 10.13.0.Building a CustoMac Hackintosh: Buyer's Guide
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