Omnibook Stuck at HP logo after Windows Update KB5121003

[JoshR95]

Brand new laptop. After going thru setup, Windows Update runs. When Windows Update KB5121003 is applied, Omnibook X Flip (Ryzen AI 465) notebook hangs at HP logo on boot.

Identical symptoms to:

https://learn.microsoft.com/en-us/answers/questions/5982539/windows-11-kb5121003-installation-and-bo...

and

https://www.reddit.com/r/techsupport/comments/1vuztj2/brand_new_hp_laptop_becomes_stuck_on_bootlogo/

[Venom21]

Do this:

1. Hold the power button for about 10 seconds until the Nitro turns off.
2. Turn it on.
3. When the Acer logo or Windows spinning dots appear, hold the power button again until it shuts down.
4. Repeat this interruption twice.
5. Turn it on a third time and let it continue. Windows should display Preparing Automatic Repair. 
6. Once in Windows RE, select Troubleshoot > Advanced options > Uninstall Updates.
7. Select and Uninstall the latest KB5121003 update you did. 
8. Now check

[Dan873]

Is HP looking at this? Seems a lot of people are getting this, particularly with HP Omnibooks and Omniflips 

 https://www.reddit.com/r/techsupport/comments/1vuztj2/brand_new_hp_laptop_becomes_stuck_on_bootlogo/ https://learn.microsoft.com/en-us/answers/questions/5982539/windows-11-kb5121003-installation-and-bo...

My theory is that Microsoft update expired boot certificates in the update that the BIOS on the laptop is incomputable with, but I'd like confirmation of that before I start updating the BIOS (which has it's own risks). Looks like my laptop has BOIS F.06  from April but there is a later one F.06 Rev.A that came out 2 weeks after. I'm wondering if that'll work, but I don't want to start hacking without someone from HP confirming the fix.

Anyway the whole thing seems like a giant mess that's been going on for a few weeks now. Seems like between Microsoft and HP they somehow managed to brick a bunch of brand new laptops and that's not acceptable. I spent a lot of hours researching and trying to fix it, but the only thing that works is backing out the Windows update.  If my theory is right, until there's a BOIS update compatible with the new certificates, the only thing to do is pause Windows updates.

[YuyaPapa]

私の PC（HP OmniBook X Flip 14-kc0008AU）は、買ってあまり時間が経過しておらず、ソフトウェアもそれほど入れていないクリーンな状態ですが、 KB5121003 だけでなく、KB5120998 をインストールした後の再起動でも、HP ロゴが表示された状態から先に進みません。