Software⏱️ 2 min read📅 2026-05-31

How to Fix: Hyper-V VM won't boot from Cd, error: "unsigned image's hash is not allowed"

Windows Hyper-V VM boot issue from CD due to unsigned image hash error.

Quick Answer: Check the ISO file for the Debian installation media and ensure it is signed with a trusted digital certificate. If necessary, use an alternative signed ISO or modify the VM's boot settings to ignore the hash check.

The error message "unsigned image's hash is not allowed" in Hyper-V can be caused by a variety of factors, including an outdated or corrupted ISO file, incorrect boot order settings, or issues with the VM's configuration. To resolve this issue, follow these steps:

✅ Best Solutions to Fix It

Method 1: Update ISO File

  1. Step 1: Check the Hyper-V VM's boot order settings and ensure that the CD/DVD drive is set as the primary device.
  2. Step 2: Update the ISO file to the latest version of Debian. You can download the latest ISO from the official Debian website or use a reputable mirror.

Method 2: Reconfigure VM Settings

  1. Step 1: Open the Hyper-V manager, select the problematic VM, and click on 'Edit settings'.
  2. Step 2: In the 'Boot options' section, ensure that the CD/DVD drive is set as the primary device. You can also try setting the VM's boot order to 'Legacy' or 'UEFI' depending on your system configuration.

🎯 Final Words

In most cases, updating the ISO file or reconfiguring the VM settings should resolve the issue. If you continue to experience problems, it may be necessary to consult the Hyper-V documentation or seek further assistance from Microsoft support.

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