Default boot device missing or boot failed : r/LenovoLegion
Fixed – Default Boot Device Missing or Boot Failed on Lenovo/Acer - MiniTool | Lenovo, System backup, Fails
Lenovo thinkbook default boot device missing - Microsoft Q&A
Default boot device missing or boot failed. - Microsoft Community
Lenovo Y540, keep getting this error every 2 or 3 weeks, Default Boot Device Missing. After restarting, gives a BSOD "WHEA Uncorrectable Error" then after restarting again, everything is fine. Both SSD
Fix “Default Boot Device Missing or Boot Failed” Error in Windows 8 | Vtechsquad Blog - Online Technical Support Services | Self Help
How to Fix "Default Boot Device Missing or Boot Failed" Error
Default Boot Device Missing or Boot Failed? Top 6 Solutions!