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+====== 2.1.1 Setup Operating System onto the Raspberry Pi ======
+===== Download the image =====
+I would recommend a 64-bit system, as Raspberry Pi 3B, 3B+ and 4B are 64 bit hardware.
+Raspberry Pi Foundation provides a suitable system at https://www.raspberrypi.com/software/operating-systems/#raspberry-pi-os-64-bit . I would recommend "Raspberry Pi OS Lite" 64-bit. The latest one was released April 4th 2022.
+===== Write to micro-SD card =====
+With this release, the default user //pi// was removed! \\
+I would suggest to setup the user //scanner// - see https://www.raspberrypi.com/news/raspberry-pi-bullseye-update-april-2022/ \\
+Also don't forget to activate SSH daemon for remote (headless) setup.
+You might follow the setup instructions at https://www.raspberrypi.com/software/
+==== Details for writing from a Linux PC ====
+=== check and verify your micro-SD cards' device name ===
+verify to have the correct device name for the (new) SD card\\
+for not overwriting and trashing your system\\
+or overwriting relevant data!
+  * check for existing block devices with ''lsblk'' - before inserting the SD card to be written.
+  * on another terminal (SSH-session), you may check ''dmesg -w'' while inserting
+  * re-execute and compare output of ''lsblk'' to previous output
+optionally, you might check existing contents by mounting - **replace** ''/dev/sdb'' with **YOUR** device! \\
+but keep the digit after ''/dev/sdb'', e.g. ''/dev/sdb1'' is changed into ''/dev/sdc1''
+<code>
+sudo fdisk -l /dev/sdb   # lists partitions
+mkdir /dev/shm/sdb1
+sudo mount /dev/sdb1 /dev/shm/sdb1
+</code>
+check the contents, e.g. with ''cd'', ''ls'', .. or ''mc''
+and then unmount each checked partition
+<code>
+sudo umount /dev/shm/sdb1
+</code>
+=== (over)write the micro-SD card ===
+don't forget to **replace** ''/dev/sdb'' with **YOUR** micro-SD cards' device name!
+<code>
+xzcat 2022-04-04-raspios-bullseye-arm64-lite.img.xz | sudo dd bs=4M of=/dev/sdb
+sync
+</code>
+unplug / eject the micro-SD card with the adapter
+=== prepare auto-generating user and SSH activation ===
+re-insert micro-SD card and mount\\
+again: **replace** ''/dev/sdb'' with **YOUR** device!
+<code>
+sudo fdisk -l /dev/sdb
+mkdir /dev/shm/sdb1
+sudo mount /dev/sdb1 /dev/shm/sdb1
+</code>
+we need an enctypted version for the password ''scanner123'' - you might change in following
+<code>
+echo 'scanner123' | openssl passwd -6 -stdin
+</code>
+there comes a huge alphanumeric string. copy it into your clipboard - or select for pasting with middle mouse button.
+for later automatic generation of user ''scanner'' - you might change in following
+<code>
+echo 'scanner:$6$6t.t7wG2IkuS0IHn$COM.bQQWWbTYtLCkLf5Mk6PUUnpkZN7R0JLsXwUfHDPx6Hc0jK77Ci28zR01rdyN.1jRQGuHnP1rq78I0xzF.0' >/dev/shm/sdb1/userconf.txt
+</code>
+and for later activation of SSH-daemon
+<code>
+touch /dev/shm/sdb1/ssh
+</code>
+you might setup / change other bootup options for the Raspberry Pi, e.g. display options, ..
+when finished, unmount\\
+<code>
+sudo umount /dev/shm/sdb1
+</code>
+and unmount the micro-SD card from the PC
+now, you are ready to insert the prepared SD card into the Pi and boot from it.
+using Pi headless over Ethernet network, you might lookup the IP address; the default hostname is ''raspberrypi''
+===== SSH Software hints =====
+On a Windows PC, you can use one of the following programs to establish an SSH connection
+  * ''PuTTY'': https://www.putty.org/
+  * ''MobaXterm'': https://mobaxterm.mobatek.net/
+  * //Windows Subsystem for Linux// (WSL/LXSS) with Windows 10
+for sure, there are other alternatives. i would recommend //MobaXterm//,
+which has a builtin X-server, that would allow to run GUI programs.
+if really necessary, i would suggest ''JuiceSSH'' (https://juicessh.com/) for SSH from an Android smartphone or tablet.
+===== System Update & Configuration =====
+Please continue with [[fmlist_scanner:prepare_exisiting_linux_or_preinstalled_pi|2.2 Setup on a pre-installed Pi or PC]]
+afterwards, check other configuration options - special for Raspberry Pi, e.g. speaker output:
+<code>
+sudo raspi-config
+</code>