xleech Posted November 7, 2022 Share Posted November 7, 2022 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. Link to comment Share on other sites More sharing options...
Moderators Jake Lo Posted November 8, 2022 Moderators Share Posted November 8, 2022 in the config file, under UEFI/APFS, change mindate and minversion from 0 to -1 Link to comment Share on other sites More sharing options...
xleech Posted November 8, 2022 Author Share Posted November 8, 2022 thanks for the suggestion. It worked. I have another problem. My display brightness cannot be adjusted.. slider does not work. TIA. config.plist.zip Link to comment Share on other sites More sharing options...
Moderators Jake Lo Posted November 8, 2022 Moderators Share Posted November 8, 2022 post ioreg file using ioregistryexplorer.app 2.1 Link to comment Share on other sites More sharing options...
xleech Posted November 11, 2022 Author Share Posted November 11, 2022 finally got back to mackintosh. I cleared nvram, made a fresh copy of EFI and tried again. Everything working so far. Keeping my fingers crossed. thanks for all your help Link to comment Share on other sites More sharing options...
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