Welcome to the forum! 
I’m afraid that won’t work on legacy mode. The flag esp works if booting in UEFI mode. Did you format that partition as FAT32?
Moreover, for UEFI to work properly, you need to make sure that the HDD has a GPT partition table.
I’d recommend you take a look at the guidelines for a manual installation in the User Guide
Another useful links below. Please check them out:
Hope that helps! 
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