diff --git a/scripts/_common.sh b/scripts/_common.sh
index 944a65e..c5d3ff0 100755
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -8,6 +8,16 @@
 # PERSONAL HELPERS
 #=================================================
 
+_validate_color() {
+    # Remove eventual '#' prefix from color
+    color=${color#"#"}
+    # Check if the format is valid, put #555555 instead
+    if [[ ! "$color" =~ ^[A-Fa-f0-9]{6}$ ]]; then
+        color=555555
+    fi
+    echo "$color"
+}
+
 #=================================================
 # EXPERIMENTAL HELPERS
 #=================================================
diff --git a/scripts/install b/scripts/install
index 935ae2f..cd786a7 100755
--- a/scripts/install
+++ b/scripts/install
@@ -18,13 +18,8 @@ ynh_app_setting_set --app="$app" --key=password --value="$password"
 
 password_sha1=$(python -c 'import hashlib; import sys; a=str(sys.argv[1]); print(hashlib.sha512(a.encode("UTF-8")).hexdigest())' $password)
 
-# Remove eventual '#' prefix from color
-color=${color#"#"}
-# Check if the format is valid, put #555555 instead
-if [[ ! "$color" =~ ^[A-Fa-f0-9]{6}$ ]]; then
-    color=555555
-fi
-# Save color back
+# Validate, fix and set default value for color
+color="$(_validate_color)"
 ynh_app_setting_set --app="$app" --key=color --value="$color"
 
 #=================================================
diff --git a/scripts/upgrade b/scripts/upgrade
index 74fd19f..001e48a 100755
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -9,6 +9,16 @@
 source _common.sh
 source /usr/share/yunohost/helpers
 
+#=================================================
+# INITIALIZE AND STORE SETTINGS
+#=================================================
+
+password_sha1=$(python -c 'import hashlib; import sys; a=str(sys.argv[1]); print(hashlib.sha512(a.encode("UTF-8")).hexdigest())' $password)
+
+# Validate, fix and set default value for color
+color="$(_validate_color)"
+ynh_app_setting_set --app="$app" --key=color --value="$color"
+
 #=================================================
 # DOWNLOAD, CHECK AND UNPACK SOURCE
 #=================================================
@@ -23,19 +33,25 @@ chown -R "$app:www-data" "$install_dir"
 #=================================================
 # STORE THE CONFIG FILE CHECKSUM
 #=================================================
+ynh_script_progression --message="Updating configuration files..."
+
+# Workaround for php code containing __FILE__ and __DIR__
+file=__FILE__
+dir=__DIR__
+
+ynh_add_config --template="config.php" --destination="$install_dir/config.php"
+ynh_add_config --template="pheditor.php" --destination="$install_dir/pheditor.php"
+
+mkdir -p "$install_dir/templates/minimaxing/"
+ynh_add_config --template="minimaxing.less" --destination="$install_dir/templates/minimaxing/minimaxing.less"
+ynh_add_config --template="minimaxing.css" --destination="$install_dir/templates/minimaxing/minimaxing.css"
+
+mkdir -p "$install_dir/templates/mimoza/"
+ynh_add_config --template="mimoza.css" --destination="$install_dir/templates/mimoza/mimoza.css"
 
-### Verify the checksum of a file, stored by `ynh_store_file_checksum` in the install script.
-### And create a backup of this file if the checksum is different. So the file will be backed up if the admin had modified it.
-ynh_backup_if_checksum_is_different --file="$install_dir/config.php"
-ynh_backup_if_checksum_is_different --file="$install_dir/config.t2t"
-ynh_backup_if_checksum_is_different --file="$install_dir/menu.php"
-# Recalculate and store the checksum of the file for the next upgrade.
-ynh_store_file_checksum --file="$install_dir/config.php"
 ynh_store_file_checksum --file="$install_dir/config.t2t"
 ynh_store_file_checksum --file="$install_dir/menu.php"
 
-#ynh_restore_file -o "conf/config.php"
-
 #=================================================
 # REAPPLY SYSTEM CONFIGURATIONS
 #=================================================