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MRT-X UFEI Malware Malware Removal Malware Removal Team Unified Extensible Firmware Interface GPT

[MRT-X] UFEI

Posted Mar 21, 2025 09:36 AM
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UEFI (Unified Extensible Firmware Interface) – Complete Guide

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1. What is UEFI?
UEFI (Unified Extensible Firmware Interface) is a modern firmware interface that replaces the traditional BIOS (Basic Input/Output System). It provides:
  • Faster boot times.
  • Secure Boot for protection against malware.
  • Support for large hard drives (2TB+ with GPT).
  • A graphical interface with mouse support.
  • Enhanced system diagnostics and security features.

UEFI is the standard firmware on most modern computers.

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2. UEFI vs BIOS – Key Differences
BIOS (Legacy Firmware)
  • Uses the MBR (Master Boot Record) partition scheme.
  • Limited to 2TB disk sizes.
  • Text-based interface, keyboard-only.
  • Uses 16-bit code, limiting functionality.

UEFI (Modern Firmware)
  • Uses the GPT (GUID Partition Table) partition scheme.
  • Supports disk sizes larger than 2TB.
  • Graphical interface with mouse and keyboard support.
  • Uses 32-bit or 64-bit code, allowing more advanced features.

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3. How to Check if Your System Uses UEFI or BIOS
Method 1: Using System Information
  • Press Win + R, type msinfo32, and press Enter.
  • Look for BIOS Mode:
    - If it says UEFI, your system is using UEFI.
    - If it says Legacy, your system is using BIOS.

Method 2: Using Command Prompt
  • Open Command Prompt (Admin).
  • Type:
    Code
    bcdedit /enum
  • Look for the line:
    Code
    path \EFI\Microsoft\Boot\bootmgfw.efi
  • If you see "EFI," your system is using UEFI.

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4. UEFI Boot Process
The UEFI boot process is different from BIOS:
  1. The computer starts and UEFI firmware initializes hardware.
  2. UEFI firmware checks the boot configuration in the EFI System Partition (ESP).
  3. The UEFI Boot Manager loads the OS Bootloader (e.g., Windows Boot Manager, GRUB).
  4. The bootloader loads the operating system.

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5. What is Secure Boot?
Secure Boot is a UEFI feature that protects against bootkits and malware by allowing only digitally signed software to run.

How to Check if Secure Boot is Enabled:
  • Press Win + R, type msinfo32, and press Enter.
  • Look for Secure Boot State:
    - If it says On, Secure Boot is enabled.
    - If it says Off, Secure Boot is disabled.

How to Enable Secure Boot:
  • Restart your PC and enter UEFI Firmware (press F2, F12, DEL, ESC, or your motherboard's key).
  • Navigate to Secure Boot settings.
  • Enable Secure Boot and save changes.
  • Restart your PC.

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6. How to Access UEFI Firmware Settings
  • Open Settings > Update & Security > Recovery.
  • Under Advanced Startup, click Restart now.
  • Select Troubleshoot > Advanced Options > UEFI Firmware Settings.
  • Click Restart to enter the UEFI menu.

Alternatively, you can access UEFI by pressing F2, DEL, ESC, or F12 during boot.

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7. What is the EFI System Partition (ESP)?
The EFI System Partition (ESP) is a special partition used by UEFI to store boot-related files.

To check if you have an ESP partition:
  • Open Command Prompt (Admin).
  • Type:
    Code
    diskpart
    list disk
    select disk 0
    list partition
  • Look for EFI System Partition in the list.

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8. How to Convert MBR to GPT (UEFI Requires GPT)
If your disk is using MBR, you need to convert it to GPT for UEFI boot.

Convert MBR to GPT Without Data Loss (Windows 10+)
  • Open Command Prompt (Admin).
  • Run:
    Code
    mbr2gpt /convert /allowFullOS
  • Restart your PC.

Convert MBR to GPT (Data Will Be Erased)
  • Open Disk Management (diskmgmt.msc).
  • Delete all partitions (Backup your data first).
  • Right-click the disk and select Convert to GPT Disk.
  • Create new partitions and format the disk.

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9. How to Fix UEFI Boot Issues
If your system fails to boot, try these steps:

Method 1: Rebuild the Boot Configuration Data (BCD)
  • Boot into Windows Recovery Mode.
  • Open Command Prompt and type:
    Code
    bootrec /fixmbr
    bootrec /fixboot
    bootrec /scanos
    bootrec /rebuildbcd
  • Restart your PC.

Method 2: Restore the EFI Partition
  • Boot into a Windows recovery USB.
  • Open Command Prompt and type:
    Code
    diskpart
    list disk
    select disk 0
    list partition
    select partition X   (Replace X with the ESP partition number)
    assign letter=S
    exit
    bcdboot C:\Windows /s S: /f UEFI
  • Restart your PC.

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10. Advantages of UEFI
  • Faster boot times and better performance.
  • Secure Boot to protect against malware.
  • Supports larger drives (2TB+ with GPT).
  • Advanced diagnostics and troubleshooting.
  • Graphical user interface with mouse support.
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