내노트북 WIN7 설치후 정품인증 어떻게 하나요?

Since you are posting on ko-kr locale, but the content is in English. Therefore, I will communicate using the same language.

Hi HAPPYSANG,

Thank you for reaching out to the Microsoft Q&A Forum and sharing the details of your upgrade journey, it really helps us understand the situation. The error code 0x80072F8F usually means Windows 7 is unable to securely connect to Microsoft’s activation servers. This happens because modern servers require updated security protocols that a fresh Windows 7 installation doesn’t include by default.

Here are the options to resolve this issue, please proceed with the one you prefer:

Option 1: Fix Windows 7 for online activation

Go to Microsoft Update Catalog then search and download the updates below.

Install critical updates:

• KB4474419 (SHA‑2 support)
• KB4490628 (Servicing Stack)

Enable TLS 1.2:

• Apply KB3140245
• Check “Use TLS 1.2” in Internet Options

Retry activation:

• Press Win + R and run slui.exe
• If it still fails, use phone activation: slui.exe 4

Option 2: Reinstall Windows 10

Since your device was previously activated on Windows 10, a clean install on the SSD will auto-activate using your digital license. Just skip entering a key during setup and connect to the internet.

If you need Windows 7 for legacy software, please follow Option 1. If you’re okay with Windows 10, Option 2 is faster and avoids future compatibility issues.

I look forward to receiving your update. Let me know if you need further assistance, feel free to ask me by clicking "Add Comment". Thanks for your effort.

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