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rEFInd Boot Manager
rEFInd is a very handy program I use. As described on the website, rEFInd is a boot manager and not a boot loader.
This program is very useful in setups such as multi-boot on a macbook, for a hackintosh setup and generally for setups where you have several disks and want a single, simple boot manager to choose what to boot on your system. When I have confronted issues when trying to boot on my system, refind has saved me on many occasions.
There are a few other EFI boot managers like clover and refindplus that may suit better for your specific use case but refind generally works for me.
If you would like to check this out, download and install it today. It’s nice to be able to customise it too. Thank you to Roderick W. Smith.