No cameras working after Pi/Octopi/Python upgrades

Camera model

Raspicam Module 2
Microsoft Corp LifeCam HD-3000
Microdia Angetube Live Camera

What is the problem?

I upgraded from a Raspberry Pi 3B+ to a Raspberry Pi 5.
I also upgraded from Octopi 1.0.0 to Octopi 1.1.0 using the latest build [Octopi (new camera stack) Octopi 1.1.0 with Octoprint 1.11.3 (build 20250930141704 from branch camera-streamer) Released 2025-09-30].
Python was upgraded from 3.9.2 to 3.11.2 as well.

All three cameras work perfectly using the new camera stack in my previous config (Pi 3B+/1.11.3/1.0.0/3.9.2). I followed the tutorial linked below to set them up.

After the hardware/software upgrades (Pi 5/1.11.3/1.1.0/3.11.2), no cameras work. I followed the same tutorial to set up multicam, but also noting that no camera initially worked using the default single cam config.

In the browser, all I see is this message for all three feeds:

What did you already try to solve it?

Consulted community articles, mainly
Camera-streamer configuration on the new camera stack for OctoPi - Get Help / Guides - OctoPrint Community Forum
(Tutorial) Adding multiple USB webcams to Octoprint, using new Webcam stack - Get Help / Webcams - OctoPrint Community Forum
After migration from Octopi 1.0.0 to 1.1.0 webcam stream is not working (Raspi Cam v2) - Get Help / Webcams - OctoPrint Community Forum
plus a lot of Googling, modifying camera conf files, reflashing, restarting, getting nowhere

lsusb shows both usb cams are available
libcamera-hello returns 'Command not found'

Have you tried running in safe mode?

Yes, but there's no cam control in safe mode.

Did running in safe mode solve the problem?

Nope.

Systeminfo Bundle

This is the working Raspi 3B+ config. I thought it might be useful to compare.
[Raspi3b] octoprint-systeminfo-20251004100847.zip (48.1 KB)

This is the upgraded config that does not work. Same cams. Only differences Raspi 5, Octopi 1.1.0, Python 3.11.2.
[Raspi5] octoprint-systeminfo-20251004142735.zip (116.1 KB)

WRITE HERE

Thanks for any assistance and ideas. I'm no expert, but am eager to try some fixes.

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@w00termelon I too have been grossly misled by that defective "new camera stack" build.
It should be renamed to "defective camera stack" and marked as a early alpha release at best.

the solution for you is to reflash a normal OctoPi