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E7240: problems trying to upgrade to Big Sur


xleech

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I have a Dell E7240 running Catalina with Open Core using Jake Lo's EFI which has been very stable.  I wanted to try upgrading to Big Sur. So I downloaded Jake Lo's OC 0.7.8 and tried to boot up using the downloaded file from a USB drive. Laptop boots up, but does not see the system APFS volumes. Same thing happens with OC 0.8.4. I would appreciate guidance.

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