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How to Switch from BIOS to UEFI - Complete Guide

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How to Switch from BIOS to UEFI - Complete Guide

Question: How do I switch my VM from BIOS to UEFI?

Answer: Change BIOS type and configure boot properly

Why Switch to UEFI?

Benefits of UEFI

  • Secure Boot: Protects from boot malware
  • GPT Support: Disks larger than 2TB
  • Faster Boot: Modern boot technology
  • Better Features: NVRAM, restart fixes

How to Change BIOS Type

Method 1: Web UI

  1. Go to VM → Options
  2. Edit BIOS
  3. Select OVMF
  4. Save

Method 2: CLI

qm set 100 --bios ovmf

How to Add EFI Disk

Create EFI Partition

# Add EFI disk
qm set 100 --efidisk0 local:1G

Verify EFI Disk

qm config 100 | grep efidisk

How to Configure Boot Order for UEFI

Set Boot Order

# Boot from EFI disk first
qm set 100 --boot order=efidisk0
 
# Or with other options
qm set 100 --boot order=efidisk0;scsi0

How to Enable Secure Boot

Prerequisites

  • OVMF BIOS enabled
  • EFI disk added

Enable Secure Boot

# Enable secure boot
qm set 100 --bios ovmf --secure-boot 1
 
# Default VM certificates
qm set 100 --bios ovmf

Keywords

uefi secureboot bios conversion how-to efi

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