I took the opportunity over the Christmas break to upgrade one of the Edge Cluster 12's to Raspberry Pi OS based upon Debian Trixie. They had been running the Debian Bookworm version of Raspberry Pi OS. Unfortunately I ran across a couple of problems.
There is a "design feature" with the Raspberry Pi Imager v2 where the Raspberry Pi foundation have removed the ability to customize images, so one cannot set the host name, user name, password or other settings. Well technically you can but only by writing JSON code for the Imager. I strongly recommend you keep Imager 1.9 if you need this ability.
Coupled with being unable to customize the image the Dec 2025 release of Raspberry Pi OS has changed some boot parameters so one cannot (even using Imager 1.9) customize the image.
For more information you can read the bug report on Github HERE where the developer has closed the bug as "won't fix".
Despite the above I managed (after a lot of attempts) to get 12 new micro SD cards imaged and replaced the existing ones in one of the Edge Cluster 12's. Those 12 Pi4's have been running Einstein@home work since. The Pi5's were upgraded soon after the Raspberry Pi OS based on Debian Trixie became available. That leaves me with another Edge Cluster 12 (ie 12 x Pi4s) to upgrade.
My current install process is to use Imager 1.9 and the Oct 2025 release to image the SD card. Once done and the Pi has booted do an "apt update" and "apt upgrade -y" to get it up to date.
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