Before you ask questions about libcamera and camera drivers

“Even the help instructions are wrong. /boot/config.txt doesn’t exist anymore. on the latest OFFICIAL Raspberry pi OS /boot/config.txt is now at /boot/firmware/config.txt. ALL OF THEIR CAMERAS ARE BROKEN due to this.”

Yes, that seems to be the case. I have not been able to get a new 64mp camera to work with a new Raspberry Pi5.
There appear to be multiple issues. config.txt is only one such. I am getting a chip id error reported in dmesg, while another user with a new 64mp camera and a new Pi5 passes that particular check - but he was missing /usr/share/libcamera/ipa/rpi/pisp/arducam_64mp.json - which was installed on my system - so I gave him that file; and he then ran into another layer of libcamera errors.

For details, see our exchange down in this thread: