I was able to downgrade to 6.12.20. You apparently can’t use “apt install -reinstall” to bump down to 6.12.20. I ran “apt list -a” to confirm that I had 6.12.20 in my repository.
sudo apt install \
linux-image-6.12.20+rpt-rpi-2712=1:6.12.20-1+rpt1~bpo12+1 \
linux-headers-6.12.20+rpt-rpi-2712=1:6.12.20-1+rpt1~bpo12+1
I located the files inside /boot/
vmlinuz-6.12.20+rpt-rpi-2712
initrd.img-6.12.20+rpt-rpi-2712
and copied these into /boot/firmware
Then I edited /boot/firmware/config.txt to add the following lines:
kernel=vmlinuz-6.12.20+rpt-rpi-2712
initramfs initrd.img-6.12.20+rpt-rpi-2712 followkernel
sudo cp /boot/vmlinuz-6.12.20+rpt-rpi-2712 /boot/firmware/kernel8.img
sudo reboot
after confirm running kernel with uname -a.
After I did this, my pose_estimation.py demo works and seems pretty stable with video files, --input rpi and --input usb!
Hope this helps.
-Ira