diff --git a/conf/config.yaml b/conf/config.yaml
index dd227f6..cbe23d0 100644
--- a/conf/config.yaml
+++ b/conf/config.yaml
@@ -91,7 +91,7 @@ signal:
 bridge:
     # Localpart template of MXIDs for Signal users.
     # {{.}} is replaced with the internal ID of the Signal user.
-    username_template: sg_{{.UUID}}
+    username_template: sg_{{.}}
     # Displayname template for Signal users. This is also used as the room name in DMs if private_chat_portal_meta is enabled.
     # {{.ProfileName}} - The Signal profile name set by the user.
     # {{.ContactName}} - The name for the user from your phone's contact list. This is not safe on multi-user instances.
@@ -301,7 +301,7 @@ bridge:
 
 # Logging config. See https://github.com/tulir/zeroconfig for details.
 logging:
-    min_level: _PRINT_LEVEL__
+    min_level: info
     writers:
     - type: stdout
       format: pretty-colored
diff --git a/manifest.toml b/manifest.toml
index 5d160cb..901bd92 100644
--- a/manifest.toml
+++ b/manifest.toml
@@ -13,7 +13,7 @@ maintainers = ["MayeulC"]
 
 [upstream]
 license = "AGPL-3.0-or-later"
-userdoc = "https://docs.mau.fi/bridges/python/signal/index.html"
+userdoc = "https://docs.mau.fi/bridges/go/signal/index.html"
 code = "https://github.com/mautrix/signal"
 fund = "https://github.com/sponsors/tulir"
 
diff --git a/scripts/_common.sh b/scripts/_common.sh
index a39c092..b8fe056 100644
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -4,10 +4,6 @@
 # COMMON VARIABLES
 #=================================================
 
-signald_data="/var/lib/signald"
-signald_exe="/usr/bin/signald"
-signald_user="signald"
-
 enable_relaybot=true
 
 #=================================================
diff --git a/scripts/backup b/scripts/backup
index 3486259..d70f34a 100755
--- a/scripts/backup
+++ b/scripts/backup
@@ -33,7 +33,7 @@ ynh_backup --src_path="/etc/logrotate.d/$app"
 # BACKUP VARIOUS FILES
 #=================================================
 
-ynh_backup --src_path="$signald_data"
+# TODO: check if there are some files to backup
 
 ynh_backup --src_path="/var/log/$app/"
 
diff --git a/scripts/install b/scripts/install
index 93245d5..4244856 100755
--- a/scripts/install
+++ b/scripts/install
@@ -42,24 +42,17 @@ ynh_app_setting_set --app=$app --key=synapse_instance --value=$synapse_instance
 ynh_app_setting_set --app=$app --key=server_name --value=$server_name
 ynh_app_setting_set --app=$app --key=mautrix_version --value=$mautrix_version
 
-
-# Add the user to the signald group. The signald group was created when the signald
-# package was installed from the extra repository
-# resolved by https://gitlab.com/signald/signald/-/commit/278240f3f1cc40a3b444c958b68ca3d6908e98a8
-usermod -a -G "$signald_user" "$app"
-
 #=================================================
 # DOWNLOAD, CHECK AND UNPACK SOURCE
 #=================================================
-ynh_script_progression --message="Setting up source files..." --weight=3
+ynh_script_progression --message="Setting up source files..." --weight=5
 
 # Download, check integrity, uncompress and patch the source from app.src
-ynh_setup_source --dest_dir="$install_dir/src"
+ynh_setup_source --dest_dir="$install_dir"
 
-chmod -R o-rwx "$install_dir"
-chown -R "$app:$app" "$install_dir"
-
-mkdir -p /var/log/$app
+chmod 750 "$install_dir"
+chmod -R 750 "$install_dir"
+chown -R $app:$app "$install_dir"
 
 #=================================================
 # ADD A CONFIGURATION
@@ -71,28 +64,15 @@ ynh_add_config --template="config.yaml" --destination="$install_dir/config.yaml"
 chmod 400 "$install_dir/config.yaml"
 chown "$app:$app" "$install_dir/config.yaml"
 
-#=================================================
-# INSTALL MAUTRIX-BRIDGE PYTHON MODULE
-#=================================================
-ynh_script_progression --message="Installing Mautrix-Bridge Python Module..." --weight=6
-
-if [ "$YNH_ARCH" == "armhf" ] || [ "$YNH_ARCH" == "armel" ]; then
-    # Install rustup is not already installed
-    # We need this to be able to install cryptgraphy
-    _install_rustup
-fi
-
-_mautrix_signal_build_venv
-
 #=================================================
 # REGISTER SYNAPSE APP-SERVICE
 #=================================================
 ynh_script_progression --message="Registering Synapse app-service" --weight=1
 
-"$install_dir/venv/bin/python3" -m mautrix_signal -g -c "$install_dir/config.yaml" -r "/etc/matrix-$synapse_instance/app-service/$app.yaml"
-"/opt/yunohost/matrix-$synapse_instance/update_synapse_for_appservice.sh" || ynh_die --message="Synapse can't restart with the appservice configuration"
+$install_dir/mautrix-signal -g -c $install_dir/config.yaml -r /etc/matrix-$synapse_instance/app-service/$app.yaml
+/opt/yunohost/matrix-$synapse_instance/update_synapse_for_appservice.sh || ynh_die --message="Synapse can't restart with the appservice configuration"
 
-chown -R "$app:$app" "$install_dir"
+chown -R $app:$app "$install_dir"
 ynh_store_file_checksum --file="/etc/matrix-$synapse_instance/app-service/$app.yaml"
 ynh_store_file_checksum --file="$install_dir/config.yaml"
 
diff --git a/scripts/remove b/scripts/remove
index 403f0c0..e1f2321 100755
--- a/scripts/remove
+++ b/scripts/remove
@@ -48,8 +48,7 @@ ynh_psql_execute_as_root --database="$synapse_db_name" --sql="DROP OWNED BY \"$a
 #=================================================
 ynh_script_progression --message="Removing various files..." --weight=6
 
-ynh_secure_remove --file="$signald_data"
-ynh_secure_remove --file="$signald_exe"
+# TODO: check if there is a data dir or some files to remove
 
 # Remove a directory securely
 ynh_secure_remove --file="/etc/matrix-$synapse_instance/app-service/$app.yaml"
diff --git a/scripts/restore b/scripts/restore
index 778dce8..adcf9e2 100755
--- a/scripts/restore
+++ b/scripts/restore
@@ -35,32 +35,22 @@ ynh_psql_connect_as --user="$db_user" --password="$db_pwd" --database="$db_name"
 # RESTORE VARIOUS FILES
 #=================================================
 
-ynh_systemd_action --service_name=signald --action="stop"
-ynh_restore_file --origin_path="$signald_data"
-ynh_systemd_action --service_name=signald --action="start"
+# TODO: check if there are some files to restore
 
 ynh_restore_file --origin_path="/var/log/$app/"
 
-#=================================================
-# INSTALL MAUTRIX-BRIDGE PYTHON MODULE
-#=================================================
-ynh_script_progression --message="Installing Mautrix-Bridge Python Module..." --weight=6
-
-if [ "$YNH_ARCH" == "armhf" ] || [ "$YNH_ARCH" == "armel" ]; then
-    # Install rustup is not already installed
-    # We need this to be able to install cryptgraphy
-    _install_rustup
-fi
-
-_mautrix_signal_build_venv
 
 #=================================================
 # REGISTER SYNAPSE APP-SERVICE
 #=================================================
 ynh_script_progression --message="Registering Synapse app-service" --weight=1
 
-"$install_dir/venv/bin/python3" -m mautrix_signal -g -c "$install_dir/config.yaml" -r "/etc/matrix-$synapse_instance/app-service/$app.yaml"
-"/opt/yunohost/matrix-$synapse_instance/update_synapse_for_appservice.sh" || ynh_die "Synapse can't restart with the appservice configuration"
+$install_dir/mautrix-signal -g -c $install_dir/config.yaml -r /etc/matrix-$synapse_instance/app-service/$app.yaml
+/opt/yunohost/matrix-$synapse_instance/update_synapse_for_appservice.sh || ynh_die --message="Synapse can't restart with the appservice configuration"
+
+chown -R $app:$app "$install_dir"
+ynh_store_file_checksum --file="/etc/matrix-$synapse_instance/app-service/$app.yaml"
+ynh_store_file_checksum --file="$install_dir/config.yaml"
 
 #=================================================
 # RESTORE SYSTEM CONFIGURATIONS
diff --git a/scripts/upgrade b/scripts/upgrade
index ff3b0da..dc2a81b 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -14,6 +14,13 @@ synapse_db_name="matrix_$synapse_instance"
 server_name=$(ynh_app_setting_get --app $synapse_instance --key server_name)
 domain=$(ynh_app_setting_get --app $synapse_instance --key domain)
 
+#=================================================
+# CHECK VERSION
+#=================================================
+ynh_script_progression --message="Checking version..." --weight=1
+
+upgrade_type=$(ynh_check_app_version_changed)
+
 #=================================================
 # STANDARD UPGRADE STEPS
 #=================================================
@@ -28,27 +35,47 @@ ynh_systemd_action --service_name=$app --action="stop" --log_path="/var/log/$app
 #=================================================
 ynh_script_progression --message="Ensuring downward compatibility..." --weight=1
 
-# Fix possible permission issues with a previous signald version, esp. with stickers
-mkdir -p /var/lib/signald/{avatars,attachments,stickers}
-chown "$signald_user:$signald_user" /var/lib/signald/{avatars,attachments,stickers}
-chmod -R g+rwX /var/lib/signald/{avatars,attachments,stickers}
+# TODO: check if there are some file that need some chown chmod
+# TODO: look at whatsapp to compare
+
+#=================================================
+# MIGRATION 1 : PYTHON TO GO BRIDGE
+#=================================================
+
+# Version 0.5.1 of Mautrix Signal Bridge is written in Go, whereas previous versions
+# were written in Python. Also signald data is not needed anymore.
+
+# Remove rustup
+
+# Remove signald and its repository
+
+# Remove signald data
+
+# Remove signald system user
+
+
 
 #=================================================
 # DOWNLOAD, CHECK AND UNPACK SOURCE
 #=================================================
-ynh_script_progression --message="Upgrading source files..." --weight=1
 
-# Download, check integrity, uncompress and patch the source from app.src
-ynh_setup_source --dest_dir="$install_dir/src" --full_replace=1
+if [ "$upgrade_type" == "UPGRADE_APP" ]
+then
+	ynh_script_progression --message="Upgrading source files..." --weight=2
 
-chmod -R o-rwx "$install_dir"
-chown -R "$app:$app" "$install_dir"
+	# Download, check integrity, uncompress and patch the source from app.src
+    ynh_setup_source --dest_dir="$install_dir"
+fi
+
+chmod 750 "$install_dir"
+chmod -R 750 "$install_dir"
+chown -R $app:$app "$install_dir"
 
 #=================================================
 # UPDATE A CONFIG FILE
 #=================================================
 ynh_script_progression --message="Updating a configuration file..." --weight=2
-
+echo "botusers=$botusers"
 if [[ -z "$botusers" ]] || [ "$botusers" == "admin" ]; then
     if_botusers="# "
 else
@@ -60,29 +87,15 @@ ynh_add_config --template="config.yaml" --destination="$install_dir/config.yaml"
 chmod 400 "$install_dir/config.yaml"
 chown "$app:$app" "$install_dir/config.yaml"
 
-#=================================================
-# UPGRADE MAUTRIX-BRIDGE PYTHON MODULE
-#=================================================
-ynh_script_progression --message="Upgrading Mautrix-Bridge Python Module..." --weight=2
-
-if [ "$YNH_ARCH" == "armhf" ] || [ "$YNH_ARCH" == "armel" ]; then
-    # Install rustup is not already installed
-    # We need this to be able to install cryptgraphy
-    _install_rustup
-fi
-
-_mautrix_signal_build_venv
-
 #=================================================
 # REGISTER SYNAPSE APP-SERVICE
 #=================================================
 ynh_script_progression --message="Registering Synapse app-service" --weight=1
 
-"$install_dir/venv/bin/python3" -m mautrix_signal -g -c "$install_dir/config.yaml" -r "/etc/matrix-$synapse_instance/app-service/$app.yaml"
-/opt/yunohost/matrix-$synapse_instance/update_synapse_for_appservice.sh || ynh_die "Synapse can't restart with the appservice configuration"
+$install_dir/mautrix-signal -g -c $install_dir/config.yaml -r /etc/matrix-$synapse_instance/app-service/$app.yaml
+/opt/yunohost/matrix-$synapse_instance/update_synapse_for_appservice.sh || ynh_die --message="Synapse can't restart with the appservice configuration"
 
-# Set permissions on app files
-chown -R "$app:$app" "$install_dir"
+chown -R $app:$app "$install_dir"
 ynh_store_file_checksum --file="/etc/matrix-$synapse_instance/app-service/$app.yaml"
 ynh_store_file_checksum --file="$install_dir/config.yaml"
 
diff --git a/tests.toml b/tests.toml
index 07836c8..251be62 100644
--- a/tests.toml
+++ b/tests.toml
@@ -12,4 +12,4 @@ test_format = 1.0
     args.botadmin = "@johndoe:synapsedomain.tld"
     args.botusers = "synapsedomain.tld"
 
-    test_upgrade_from.40c16d3c8898196c6e1a43e8f0af70c052dd41f6.name = "0.2.3~ynh1"
+    test_upgrade_from.76c28b29e4a9bfed0ef9765d08fc8f58fbd6dd2d.name = "0.4.3~ynh1"