Hi
@ronton3 Here is the simplest solution of all, best suited for a neophyte.
Download OpenCore Configurator from its official site and put it in /Applications/Utilities/.
Start the app.
Click on the OpenCore Configurator icon that appears at the top right of the menu bar.
Select one disk at a time, click, enter the password (one time is enough), and mount the EFI partitions of all the disks on the desktop.
Open each EFI partition that appeared on the Desktop and delete all of its contents.
Empty the recycle bin.
NOW you can reinstall the latest version of OCLP from scratch ONLY by selecting the main disk (appears in light blue) and immediately after its EFI (appears in light blue).
Reboot the Mac and at boot hold down the Option key until the EFI-Boot icon appears.
Select it, press enter and now you'll see that n everything will be perfectly fine again.
Hi
Warning. In addition to using OpenCore Configurator to clean up EFIs as I have described, absolutely avoid opening the "config.plist" file contained in the EFI and manipulating OCLP settings!!! Unless you are an expert and know exactly what you are doing, of course....