#StackBounty: #boot #bios #grub Can't enter to BIOS after debian install only black screen

Bounty: 50

I have Acer Aspire laptop with windows 10. recently I installed Debian 9 in a different partition and everything went fine. The second time I tried to boot into bios I only have a black screen with a dash on it.

Also I can’t boot grub because windows boot manager boots first (this is why I want to enter the bios).

Windows 10 boots just fine.

Get this bounty!!!

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