Effectively Solved: Default Boot Device Missing or Boot Failed
EFI USB Device boot failed : r/windows
Fix default boot device missing or boot failed - YouTube
My pc won't work default boot device missing or boot failed. Insert recovery media. Then select "boot manager" to choose boot device or boot recovery media. In boot manager comes up with
Default Boot Device Missing or Boot Failed.” — Acer Community
Fixed – Default Boot Device Missing or Boot Failed on Lenovo/Acer