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+# Before starting.
+
+Go read the [System.md](System.md) file before.
+
+# Create user bin directories
+
+```
+mkdir -p $HOME/.local/bin
+echo "export PATH=$HOME/.local/bin:\$PATH" >> ~/.bashrc
+```
+
+# Install the pico-sdk and picotool
+
+See more on [Poivron-Robotique](https://poivron-robotique.fr/Rpi-Pico-Installer-l-environnement-de-developpement-sur-Debian-11.html).
+
+Install dependencies.
+```
+sudo apt install git make cmake gcc-arm-none-eabi gcc g++ cutecom libusb-1.0-0-dev
+```
+
+Create and go into pico-sdk directory.
+```
+mkdir -p $HOME/.local/share/pico-sdk
+cd $HOME/.local/share/pico-sdk
+```
+
+Clone pico-sdk.
+```
+git clone -b master --depth 1 https://github.com/raspberrypi/pico-sdk.git --shallow-submodules .
+git submodule update --init
+```
+
+Add env var.
+```
+echo "export PICO_SDK_PATH=$(pwd)" >> ~/.bashrc
+source ~/.bashrc
+```
+
+Create and go into picotool directory.
+```
+mkdir -p $HOME/.local/share/picotool
+cd $HOME/.local/share/picotool
+```
+
+Clone picotool.
+```
+git clone -b master --depth 1 https://github.com/raspberrypi/picotool.git .
+```
+
+Build picotool.
+```
+mkdir build
+cd build
+cmake ..
+make
+```
+
+And install it.
+```
+sudo cp picotool $HOME/.local/bin/
+```
+
+Add env var.
+```
+echo "export PICOTOOL_FETCH_FROM_GIT_PATH=$(pwd)" >> ~/.bashrc
+source ~/.bashrc
+```
+
+# Install the fxSDK
+
+See more on [Planet-Casio](https://www.planet-casio.com/Fr/forums/topic16614-16-giteapc-installer-et-mettre-a-jour-automatiquement-des-projets-gitea.html).
+
+Install dependencies.
+```
+sudo apt install curl git python3 build-essential cmake pkg-config python3-pil libusb-1.0-0-dev libudev-dev libsdl2-dev libpng-dev libncurses-dev libudisks2-dev libglib2.0-dev
+```
+
+Download GiteaPC.
+```
+curl "https://git.planet-casio.com/Lephenixnoir/GiteaPC/raw/branch/master/install.sh" -o /tmp/giteapc-install.sh && bash /tmp/giteapc-install.sh
+```
+
+Then install all packages.
+```
+giteapc install Lephenixnoir/fxsdk Lephenixnoir/sh-elf-binutils Lephenixnoir/sh-elf-gcc
+giteapc install Lephenixnoir/sh-elf-gdb
+giteapc install Lephenixnoir/OpenLibm Vhex-Kernel-Core/fxlibc
+giteapc install Lephenixnoir/sh-elf-gcc
+giteapc install Lephenixnoir/gint
+```
+
+# To update
+
+Apt.
+```
+sudo apt update
+sudo apt upgrade
+sudo apt autoremove --purge
+sudo apt autoclean
+```
+
+Flatpak.
+```
+sudo flatpak update
+```
+
+FxSDK.
+```
+giteapc install -u
+```