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I've succeeded at what you're attempting. Not sure what you're missing. I was able to boot from a USB drive or an added SATA drive. Getting this done typically requires turning off Secure Boot in the BIOS settings, at least initially when installing a new drive and OS. To get to the BIOS or boot-device menu, hold down the ESC key while turning on the power. This will bring up a menu for accessing the BIOS settings, or for selecting the boot device. This system will even boot ancient non-UEFI drives, but you have to turn on the Legacy Boot option in the BIOS settings. It's complicated these days, but it does work.
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