There's a new BootDevice in BIOS entry

My ryzentosh was updated to 10.15.5 with OC 0.5.9, it is weired that there comes a new boot entry before I enter BIOS, its name is **OpenCore** it splashes and back again on click. What is that and how can I delete it from the menu?

submitted by /u/happyhackerwqc
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