63089: Acronis Cyber Protect Cloud, Acronis Cyber Backup: how to check if Acronis Bootable Media is loaded in UEFI or legacy BIOS mode


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Last update: 01-05-2020

When performing troubleshooting you might need to know whether Acronis Bootable media is booted in UEFI or legacy BIOS modes.

Method 1. If you can see bootable media Loading, then pay attention to its initial screen:

  • Legacy BIOS Boot includes Welcome screen with 2 options "Rescue media" and "Continue OS Booting"
  • UEFI loader just has black screen with "Loading recovery media using UEFI Loader

Method 2. If you have System Information, collected from Bootable Media open file named dmesg.txt and search for string "efi:". If "efi:" is found then Bootable Media is booted in UEFI mode

Here is example how dmesg.txt may look like when booted in UEFI mode

BIOS-e820: [mem 0x00000000fee00000-0x00000000fee00fff] reserved
BIOS-e820: [mem 0x00000000ff000000-0x00000000ffffffff] reserved
BIOS-e820: [mem 0x0000000100000000-0x000000022edfffff] usable
NX (Execute Disable) protection: active
efi: EFI v2.31 by American Megatrends
efi:  ACPI=0xc8fee000  ACPI 2.0=0xc8fee000  SMBIOS=0xf04c0  MPS=0xfd6a0 
SMBIOS 2.7 present.
DMI: Dell Inc. OptiPlex 9020/00V62H, BIOS A20 05/23/2017
tsc: Fast TSC calibration using PIT
tsc: Detected 3292.511 MHz processor
e820: update [mem 0x00000000-0x00000fff] usable ==> reserved
e820: remove [mem 0x000a0000-0x000fffff] usable


Some useful information about UEFI and Legacy Boot for Windows can also be found here: https://docs.microsoft.com/en-us/windows-hardware/manufacture/desktop/boot-to-uefi-mode-or-legacy-bios-mode