Is HW Platfom "armv5tel" Supported?

After further reading your post @pilo , I understand your question better than I did. I'd suggest:

  1. upgrade successfully to Bookworm (Debian 12.9).
  2. Sort out your RAM usage. 128 or 256 MB. If you have only 128MB, think about minimizing usage of RAM and CPU cyles.
  3. You'll have to research a bit on this sight regarding armel/armv5tel/kirkwood... there are a few threads that explain the process... the install scripts need to be selected carefully from pihole git feeds and you have to pass flags like PIHOLE_SKIP_OS_CHECK=true and PIHOLE_SKIP_FTL_CHECK=true, prepending these to the ./basic-install.sh command.

Some of the background for this is here ( Unsupported/binary branch: 1 proposal and 1 question ) and in a few other places.

Also, you'll have to make sure you pull the correct git branches... this is in flux right now and IIRC it is not in the main installer branches, but in unsupported/binary or similarly titled.