Editing RaspberryPi4B (section)

===Operating System===
* at 2025-09-15 change to version 12 bookworm
* install rpi imager tool by
** <code>sudo apt update</code>
** <code>sudo apt install rpi-imager</code>
* start VNCViewer on Laptop
* open cmd shell and <code>rpi-imager</code>
* select 64bit OS (bookwarm) and write to SD writer
* poweroff and change SD, plug-in monitor, mouse and keyboard
* switch on until asked to set
** Country (Germany, German, Berlin)
** User (uwe, <Lr><STANDARD><Lr>)
** reboot
* opens desktop
* open terminal for checking fixed IP
** ip link show eth0 gives MAC address e4:5f:01:47:89:ef
** this is configured in fritz box
* open terminal to enable ssh login, VNC
** <code>sudo raspi-config</code>
** Interface Options -> SSH
** Interface Options -> VNC
* check by
** <code>lsb_release -a</code>
** <code>cat /etc/os-release</code>
* insert old boot sd card
** it has two partitions boot and rootfs
* prepare backup of Raspberry 3B like on the old OS
** <code>ssh-keygen</code> and <code>ssh-key-cp</code>
** because the new OS is using a new ssh version and a check with <code>ssh -o PubkeyAcceptedAlgorithms=+ssh-rsa -o HostKeyAlgorithms=+ssh-rsa root@192.168.178.35</code> worked (login w/o password)
** create <code>~/.ssh/config</code> with
 Host raspberry3
   HostName 192.168.178.35
   User root
   PubkeyAcceptedAlgorithms +ssh-rsa
   HostKeyAlgorithms +ssh-rsa
   IdentityFile /home/uwe/.ssh/id_rsa
** can be tested by <code>ssh raspberry3</code>
** install sshfs
** install rclone and configure Google backup drive <code>uh_gdrive_backup</code> (see [https://drive.google.com/drive/folders/1m5lQlZf6a5zJwJ_MsUNu1OpwGw65IxN2 Google Drive])
* VNC is already part of installation