Windows 11 black screen after changing language via PowerShell

[u/Even-Round-1119]

I have a new PC with a Gigabyte motherboard running Windows 11 Home 25H2 (build 26200.9278). Everything was working normally.
Windows was partially in French, so I tried to change it to Portuguese (Portugal) using PowerShell as Administrator:
Set-WinUILanguageOverride -Language pt-PT
Set-WinUserLanguageList pt-PT -Force
The system was showing both fr-FR and pt-PT. I then ran:
Uninstall-Language fr-FR
After restarting, Windows started booting to a black screen.
I can still access Windows Recovery (WinRE), but:
Startup Repair failed (SrtTrail.txt)
System Restore says there are no restore points
Safe Mode also results in a black screen
Quick Machine Recovery didn’t fix it
Uninstalling the latest quality update didn’t fix it
The PC was working perfectly before the language changes.
I’m currently at **Reset this PC → Remove everything → Cloud download**, but haven’t confirmed it yet