Cannot boot to Windows, Bootable Device Not Found error after initializing Drive on Dell E6x30 systems using UEFI mode with Win 8/8.1 and ESC 2.10.2 | Wave Systems Corporation
Configuring Dell UEFI BIOS to Legacy mode to install Windows 7 - 404 Tech Support
Add a UEFI boot entry in Dell BIOS – c800
Fix: Can't re-enable UEFI plus secure boot in Dell laptops
UEFI boot sequence empty, hard drive not showing - Dell Community
Fix: Can't re-enable UEFI plus secure boot in Dell laptops
Part 4 UEFI BIOS Settings for Windows 7 SecureBoot and Legacy ROMs - YouTube