Newer Dell systems unable to boot to internal boot device in Legacy boot mode


Newer Dell systems unable to boot to internal boot device in Legacy boot mode



Newer Dell systems, such as the Latitude XX90 series laptops, are unable to boot to internal boot devices when in Legacy boot mode. This article provides more information on this issue.


Legacy Boot mode and internal boot devices

With the Boot option set to Legacy boot mode on newer series of Dell systems, you will be unable to boot to internal boot devices (including HDD, SSD, or eMMC storage devices). This issue may also occur after installing the operating system in Legacy Boot mode. A message to this affect appears in the system BIOS under the General/Boot Sequence settings (Figure 1):

Boot sequence settings
Figure 1: Boot Sequence settings

If the message highlighted above is missing from the Boot Sequence page, or if the Legacy External Devices setting is missing from the Boot Sequence settings, then update the BIOS to the latest available version at Dell Support / Drivers & Downloads. Select BIOS under the drop-down Category menu and download and install the latest available BIOS update. The Dell system must be imaged in UEFI mode unless booting to an external boot device.

NOTE: UEFI mode requires a 64-bit operating system be installed (ex, Windows 10 Pro 64-bit, Windows 10 Home 64-bit, Ubuntu 16.04 SP1 LTS 64-bit).
NOTE: Any next generation models after these systems will not have the option to boot internally in legacy mode. But it will still be possible to boot externally from legacy devices. Newer series Latitude, OptiPlex, Inspiron, Precision, Vostro, and XPS systems may experience this issue.





Article ID: SLN309720

Last Date Modified: 09/15/2020 04:13 PM

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