---
title: "NOTAM: Hardware no longer detected after Windows update! - Blog - VIER IM POTT"
description: "Several users have reported an issue whereby the driver for the Skalarki hardware can no longer be loaded because it does not comply with the Windows driver policy. The error message cited is as follows: This driver has been blockedmchpusb64.sys does"
url: "https://vier-im-pott.com/en/blog/notam-hardware-no-longer-detected-after-windows-update"
date: "2026-06-19T17:15:31+00:00"
language: "en-GB"
---
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# NOTAM: Hardware no longer detected after Windows update!
Tuesday, 16 June 2026
Several users have reported an issue whereby the driver for the Skalarki hardware can no longer be loaded because it does not comply with the Windows driver policy.
The error message cited is as follows:
> **This driver has been blocked
> mchpusb64.sys does not comply with the Windows driver policy.**
>
> by Author
The message appears following a Windows Update. The hardware can then no longer be used.
We don't have this problem on our own machines (yet), but from the user feedback we can confirm that this is a general issue, especially when installing or reinstalling the profiler. The only way to disable this issue is currently to disable driver signature enforcement. Here is how to do it:
## Method 1 (one-time disable)
This method disables signature enforcement for the **current boot session only** — the safest approach.
**Step 1 — Open Advanced Startup**
Go to **Settings → System → Recovery** and click **Restart now** under "Advanced startup."
**Step 2 — Navigate the boot menu**
Click **Troubleshoot → Advanced options → Startup Settings → Restart.**
**Step 3 — Select the option**
After the restart, press **F7** to select **"Disable driver signature enforcement."**
Windows will boot normally with enforcement disabled for this session only.
```
```
## Method 2 (permanent disable)
**Alerts**
This permanently disables enforcement until you re-enable it. Use with caution.
**Step 1 — Open Command Prompt as Administrator**
Press `Win + S`, type `cmd`, right-click **Command Prompt**, and select **Run as administrator.**
**Step 2 — Run these two commands**
```
bcdedit /set loadoptions DISABLE_INTEGRITY_CHECKS bcdedit /set testsigning on
```
**Step 3 — Restart your PC**
After rebooting, you'll see a **"Test Mode"** watermark in the bottom-right corner of the desktop — this confirms the setting is active.
**To re-enable (undo) later**, run:
```
bcdedit /set loadoptions ENABLE_INTEGRITY_CHECKS bcdedit /set testsigning off
```
---
The only permanent solution to this problem is a new driver. This is currently being developed. We'll keep you updated.
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