[BUG] Copilot+ pc and NPU not working as expected

[FrozenAssassine]

I tried to run the app on my Copilot+ supported Laptop with Snapdragon X elite CPU. I wanted to take advantage of the NPU and try out some things. But as soon as I ran the app, the window appeared, that my windows version does not support it yet. I downloaded the ISO for the latest insider preview version (27774.1000 in DEV) channel and still got the same problem. I know that the dev gallery app told me a different version, but I could not find it on the microsoft download page. What am I missing, is it the wrong version or what and if yes, where can I get the ISO of the version I need?

I also tried building the app with different preview versions of the Windows App Sdk, did not help same problem.

I can confirm, that the NPU is found by the system. The live camera studio effects and live translations work and the taskmanager shows the NPU with processing if active.

[nmetulev]

Hi @FrozenAssassine, to get the preview Windows version that supports those APIs, you will need to join the Insider Program, specifically the Dev Channel: https://www.microsoft.com/en-us/windowsinsider/getting-started

[FrozenAssassine]

Well but I am on the windows insider program. So do you mean I have to upgrade my current windows 11 stable 24h2 to insider version instead of using a prebuild iso?

[nmetulev]

That's right, you need to update to the dev channel as that build will have the apis - not sure if an ISO would.

[FrozenAssassine]

Awesome I got it mostly working. I installed the insider version directly from my stable version. Now I can download my model and well I can not run it. No output gets generated, nothing happens. Remember, that I am only talking about the NPU model with WCR, not a CPU or GPU model. Those work!

I can still confirm that the NPU works because I tested with Live Subtitles and the NPU shows usage in the taskmanager if active.

Do you know what is wrong here? I downloaded the app today (03/12/2025) from the store and I am on Windows 11 version 26120.3360 from Dev channel

record_bug.mp4

[nmetulev]

I haven't seen this, but we can try to debug. If you have visual studio and if you are up to it, you could export the project to visual studio by using the Export button. Make sure to change to Arm64 when opening the project in Visual Studio and try to run it. Once you have it running, you should be able to then step through the code and help figure out where things are failing.