Can't boot Opencore/clover on legacy bios

What's up? I'm trying to make hackintosh on old computer with non-uefi bios. But when o booting usb I have a black screen with blinking underscore ("_"). All settings of bios was been settled correctly. I don't know. Does I do something wrong, or this motherboard is too old? This is MSI H551-P31 on 1,5 version of bios. Does someone can help me? Thanks in advance.

submitted by /u/Lolekowski
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