Install fails on RPI2-B with latest image (2025-12)

Installation
1

I had a spare RPI laying around and wanted to test this.
No luck though. The installation seems to run fine until this:

  src/c/_cffi_backend.c:2:10: fatal error: Python.h: No such file or directory
      2 | #include <Python.h>
        |          ^~~~~~~~~~
  compilation terminated.
  error: command '/usr/bin/arm-linux-gnueabihf-gcc' failed with exit code 1
  [end of output]

note: This error originates from a subprocess, and is likely not a problem with pip.
ERROR: Failed building wheel for cffi
Failed to build cffi
ERROR: Failed to build installable wheels for some pyproject.toml based projects (cffi)

So I’m missing a header file; the question is which one and where to get it from.

2

A RPI2 do not have enough ram to run modern versions of HA.

3

2025.12 was the first HA Core version that is 64bit only. Pi2 does not run 64bit software, so to be expected. You can try 2025.11

4

It should run 64bit, at least revision 1.2 and 1.3.
https://www.raspberrypi.com/products/raspberry-pi-2-model-b/

5

And those revisions are very hard to find

6

Too bad but at least its clear then.
I will find some other use for it :sunglasses: