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Known update issues

Windows 11 KB5121003: HP laptops report BIOS corruption, Lenovo laptops lose AC power

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Community report – not yet confirmed by the vendor: users or trade media report on it (forums, Q&A sites, Reddit, web research), but the vendor has not confirmed the issue (yet). Use this information with caution.

Summary

Reported by users and trade media, not yet confirmed by the vendor: some HP and Lenovo laptops show problems after Windows 11 KB5121003 and the September update. HP laptops reportedly suffer BIOS corruption, failed installation and possibly no OS recovery; Lenovo laptops randomly lose AC power. Neither Microsoft nor Lenovo had commented at the time of the report.

Symptoms

  • HP: BIOS corruption, failed update installation, possibly no operating system recovery.
  • Lenovo: AC power is randomly lost, causing black screens or shutdowns.

Affected

  • Windows 11 with KB5121003 and the September 2026 update
  • Selected HP and Lenovo laptop models (models not specified in the sources)

Workaround

No workaround known.

Fix

Not fixed yet. HP has reportedly published a new BIOS, but this is not confirmed by a vendor source available to us.

Recommendation

Do not roll out KB5121003 and the September update broadly to HP and Lenovo laptops yet. Test on a pilot group first and make sure backups and recovery media are available. Check the HP and Lenovo support sites for BIOS updates and vendor statements before updating firmware or Windows on affected models.

Check script: am I affected? (PowerShell, read-only)

Check: Windows 11 KB5121003: HP laptops report BIOS corruption, Lenovo laptops lose AC power

What it checks
Checks whether the update named in the community reports is installed on this device. It changes nothing, writes no file and needs no internet.
What to do if affected
Compare the symptoms with the entry; watch for a statement from the vendor before changing anything.

Community report: not yet confirmed by the vendor. The check is based only on the details of the reports (e.g. the update named) and is an indication, not proof.

Result and exit code: AFFECTED = 5, NOT AFFECTED = 0, FIXED – solution installed = 0, UNCLEAR = 6, error = 1 (as an Intune detection script: 1 = affected, otherwise 0).

What exactly happens?

  • Only reads – changes nothing, writes no file, needs no internet and asks no questions.
  • Checks: update KB5121003 installed
  • Reports the result with one line per condition and the next step.

What is checked

  • Indication of being affected: update KB5121003 installed

How to use the script – step by step

  1. Download: on the entry page, read the terms and conditions (section "Free scripts") and the disclaimer, tick "I accept" and click "Download script". The file is saved in your "Downloads" folder.
  2. Open PowerShell: press the Start key, type "PowerShell", press Enter. No administrator rights are needed – only if the result reports conditions as "not checkable", open PowerShell as administrator (right-click "Windows PowerShell" › "Run as administrator").
  3. Change to the Downloads folder (type or paste the command, then press Enter):
    cd "$env:USERPROFILE\Downloads"
  4. Compare the checksum: the command shows a long string. It must be exactly the same as "SHA-256" on the entry page (0DFBBC621CBB8531EE78B690845224E3122B7DB5170B349574E72A2D3FA543A5). If it differs, delete the file and do not run it.
    (Get-FileHash .\ITSB-Check-hp-and-lenovo-laptops-have-problems-after-windows-11-kb51210-v1.ps1 -Algorithm SHA256).Hash
  5. Unblock the file (Windows marks downloaded files). Alternatively in Explorer: right-click the file › Properties › tick "Unblock" at the bottom › OK.
    Unblock-File .\ITSB-Check-hp-and-lenovo-laptops-have-problems-after-windows-11-kb51210-v1.ps1
  6. Allow scripts for this PowerShell window only. This only applies until you close the window – the computer's setting stays unchanged. If PowerShell asks, confirm with "Y".
    Set-ExecutionPolicy -Scope Process -ExecutionPolicy Bypass
  7. Run the script. It only checks: it changes nothing, writes no file and needs no internet.
    .\ITSB-Check-hp-and-lenovo-laptops-have-problems-after-windows-11-kb51210-v1.ps1
  8. Read the result (at the bottom): "AFFECTED" – follow the steps under "what to do" (e.g. install the update or use the entry's fix script). "NOT AFFECTED" – nothing to do. "FIXED – solution installed" – nothing to do; you can undo a workaround you applied earlier. "UNCLEAR" – not everything could be checked: compare the details in the entry manually.
  9. Download without a browser (RMM, software distribution): the address needs "&agb=1". This means the person deploying the script accepts the terms and conditions (section "Free scripts") and the disclaimer on behalf of their organisation.
    Invoke-WebRequest "https://www.it-sb.ch/ki-api/?a=dl&f=ITSB-Check-hp-and-lenovo-laptops-have-problems-after-windows-11-kb51210-v1.ps1&agb=1" -OutFile ".\ITSB-Check-hp-and-lenovo-laptops-have-problems-after-windows-11-kb51210-v1.ps1"
  10. For many devices (RMM, scheduled task): command below, exit codes 0 = not affected or fixed, 5 = affected, 6 = unclear, 1 = error. Upload it as the detection script of an Intune remediation ("Run script in 64-bit PowerShell" = Yes): there it automatically reports 1 = affected, otherwise 0 (manually with -Intune).
    powershell.exe -NoProfile -ExecutionPolicy Bypass -File .\ITSB-Check-hp-and-lenovo-laptops-have-problems-after-windows-11-kb51210-v1.ps1
    powershell.exe -NoProfile -ExecutionPolicy Bypass -File .\ITSB-Check-hp-and-lenovo-laptops-have-problems-after-windows-11-kb51210-v1.ps1 -Intune
File
ITSB-Check-hp-and-lenovo-laptops-have-problems-after-windows-11-kb51210-v1.ps1 · no administrator rights needed
Version
1 · Date 2 Nov 2026 · 25 KB
SHA-256
0DFBBC621CBB8531EE78B690845224E3122B7DB5170B349574E72A2D3FA543A5
Downloads
0

Use at your own risk – no warranty, no liability if anything does not work or is wrong. Test before use and make a backup. Our terms and conditions (free scripts) apply. Generated automatically from the vendor’s statement and checked (rules, second AI review).

Download without a browser (RMM, software distribution): address with "&agb=1" – this means the person deploying the script accepts the terms on behalf of their organisation: https://www.it-sb.ch/ki-api/?a=dl&f=ITSB-Check-hp-and-lenovo-laptops-have-problems-after-windows-11-kb51210-v1.ps1&agb=1

Reports from the community and trade media

Reports from forums, Q&A sites, Reddit and trade media – linked only, without the names of the authors; the vendor’s statement is authoritative.

Sources

Compiled from community reports and web research and translated with AI (Claude) – not yet confirmed by the vendor. The vendor’s statements are authoritative. Updated 2 Nov 2026, 06:28.

Where the information comes from

We continuously read the vendors’ official sources, community reports and trade media and summarise them in our own words, with a link to the source:

  • Microsoft: Windows release health (Windows 10/11, Server 2016 to 2025), Windows message center, known issues of Microsoft 365 Apps (Outlook, Excel, Word, PowerPoint), Edge, Intune, Autopilot, Windows 365 and Entra Connect, Microsoft KB articles with timelines, Exchange and Windows IT Pro blogs, optionally Microsoft 365 service health and message center
  • other vendors: Veeam KB, Citrix (known issues), Ubuntu and Debian (regressions), Broadcom (VMware), Fortinet, Cisco, Mozilla, Let’s Encrypt
  • community (title, short excerpt and link only, without the names of the authors): Microsoft Q&A, Microsoft Tech Community (discussions), Veeam R&D Forums, Eleven Forum
  • targeted web research with AI (Claude), e.g. on the updates of the month – this also finds discussions on Reddit and in forums; such entries are labelled as community reports until the vendor confirms them
  • early warning from trade media (title and link only): Born’s Tech and Windows World, BleepingComputer, AskWoody, Windows Latest, Windows Central, gHacks, The Windows Club, Deskmodder, Dr. Windows, WindowsArea, Frankys Web, heise online

Summary and translation with AI (Claude by Anthropic) – without any data of visitors.

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