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DELL Latitude: how to restore boot settings after changing the mainboard battery

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After a long time (several months), I wanted to use my DELL Latitude E5270. The problem: no boot device was found. The reason for this seems to be the mainboard battery, which died after such a long time of not being used. The notebook was build in November 2017 – so it already turned 6.5 years.

The battery was changed quickly. Luckily a local pc store helped me to find a new suitable battery.

After switching on the Latitude, booting was still not possible. Without the battery, the system might have being lost some boot settings.

Searching for a solution, I found a support article by DELL, which describes some boot settings to start Windows/Linux on a DELL Latitude. And after checking all the settings, I was able to boot the existing Windows again.

To check the settings, I followed these steps:

  1. From a power off state, power on the system and Press F2 at the Dell logo to boot into the BIOS setup menu.
  2. Choose General > Boot sequence and change the option from Legacy to UEFI then click Apply in the lower right corner of the screen.
Change Boot List Option from Legacy to UEFI in BIOS settings
  1. Choose General > Advanced Boot Options and disable Enable Legacy Option ROMs then click Apply in the lower right corner of the screen.
Enable Legacy Option ROMs in BIOS settings
  1. Choose Secure Boot -> Secure Boot Enable and change the option from Disabled to Enabled then click Apply in the lower right corner of the screen.
Enable the Secure Boot Enable setting in BIOS
  1. Verify the Secure Boot -> Secure Boot Enable option is Disabled in the BIOS then click Apply in the lower right corner of the screen.
Disable Secure Boot Enable in BIOS
  1. Choose SATA Operation -> SATA Operation and change to AHCI mode then click Apply in the lower right corner of the screen.
Enable SATA AHCI
  1. Click Exit in the lower right corner and wait for the system to reboot.

Source https://www.dell.com/support/kbdoc/de-de/000128655/no-boot-device-found-when-you-change-the-boot-sequence-to-legacy-mode-or-install-os-under-legacy-mode?lang=en



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