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Latitude 3400: seeking help to install Big Sur


Jorge1964

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Did you try your Big Sur disk via F12 boot menu? That would normally be expected to add an entry in the UEFI boot list.

 

Also check if you have Secure Boot set somwhere in your BIOS as you would probably need to have that disabled.

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Boot with your USB installer, select your internal disk to boot.

After booting into MacOS, mount the EFI partition of the internal drive as Hervé mentioned a few posts back. 

Mount the EFI partition of the USB drive, copy the /EFI/Boot and OC folder to your internal drive's EFI partition /EFI

Reboot without the USB

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