Boot sequence empty on bios after activating hyper-v

[cheka handy]

Hi, i tried to install android emulator on my dell laptop. When i first run the emulator it ask to activate hyper-v. So i went to control panel and tick the hyper-v option in add windows feature. Next my laptop went restart and it enter system diagnostic tool instead to windows. So i checked bios and see that all boot sequence option disappear.What i tried to fix it are:1. Enable/disable secureboot2. Enable/disable virtualization3. Enable/disable legacy bootNone worked so far

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