How To Fix (an operating system wasn't found) | bootmgr is missing | no bootable device

in this Video : how to Fix an operating system wasn't found

Can you please buy me a coffee:

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[Henry-mrtu]

Can you please support me, if this video has helped you:

[brennanburger]

Even after doing this still gives me error

[aneekdas]

bro, could you please help me fastboot was on and so i am not able to enter bios. and operating system wasn't found is showing

[switchbladesun]

It doesn’t show that I have a Windows boot

[eliaspkay]

Hello! If I did this command

diskpart
list disk
select disk 1
clean
create partition primary
select partition1
active
format fs=ntfs quick
assign
exit

but I chose disk 0 which was my ssd how do I undo that?
After I did this my pc got the message “an operating system is not found” etc

[AshiiXplayzz]

Bhaiya plzzz help hp ProBook 440g3 mai nhi ho rha interface alag hai 😢😢😢 plz help

[juhinayak]

Aisa maina Kiya but mara laptop nahi khula Mera Dell ka hi laptop hi