diff --git a/gui/package.json b/gui/package.json
index ac0b4088..34cc15e2 100644
--- a/gui/package.json
+++ b/gui/package.json
@@ -2,7 +2,7 @@
   "name": "FreeDATA",
   "description": "FreeDATA Client application for connecting to FreeDATA server",
   "private": true,
-  "version": "0.13.5-alpha",
+  "version": "0.13.6-alpha",
   "main": "dist-electron/main/index.js",
   "scripts": {
     "start": "vite",
diff --git a/modem/config.py b/modem/config.py
index 62851a68..b9e20636 100644
--- a/modem/config.py
+++ b/modem/config.py
@@ -56,7 +56,6 @@ class CONFIG:
             'enable_protocol': bool,
         },
         'MODEM': {
-            'enable_fft': bool,
             'tuning_range_fmax': int,
             'tuning_range_fmin': int,
             'enable_fsk': bool,
@@ -70,10 +69,17 @@ class CONFIG:
         },
     }
 
+    default_values = {
+        list: '[]',
+        bool: 'False',
+        int: '0',
+        str: '',
+    }
+
     def __init__(self, configfile: str):
 
         # set up logger
-        self.log = structlog.get_logger("CONFIG")
+        self.log = structlog.get_logger(type(self).__name__)
 
         # init configparser
         self.parser = configparser.ConfigParser(inline_comment_prefixes="#", allow_no_value=True)
@@ -88,6 +94,9 @@ class CONFIG:
         # check if config file exists
         self.config_exists()
 
+        # validate config structure
+        self.validate_config()
+
     def config_exists(self):
         """
         check if config file exists
@@ -99,7 +108,7 @@ class CONFIG:
             return False
 
     # Validates config data
-    def validate(self, data):
+    def validate_data(self, data):
         for section in data:
             for setting in data[section]:
                 if not isinstance(data[section][setting], self.config_types[section][setting]):
@@ -107,6 +116,41 @@ class CONFIG:
                                f" '{data[section][setting]}' {type(data[section][setting])} given.")
                     raise ValueError(message)
 
+    def validate_config(self):
+        """
+        Updates the configuration file to match exactly what is defined in self.config_types.
+        It removes sections and settings not defined there and adds missing sections and settings.
+        """
+        existing_sections = self.parser.sections()
+
+        # Remove sections and settings not defined in self.config_types
+        for section in existing_sections:
+            if section not in self.config_types:
+                self.parser.remove_section(section)
+                self.log.info(f"[CFG] Removing undefined section: {section}")
+                continue
+            existing_settings = self.parser.options(section)
+            for setting in existing_settings:
+                if setting not in self.config_types[section]:
+                    self.parser.remove_option(section, setting)
+                    self.log.info(f"[CFG] Removing undefined setting: {section}.{setting}")
+
+        # Add missing sections and settings from self.config_types
+        for section, settings in self.config_types.items():
+            if section not in existing_sections:
+                self.parser.add_section(section)
+                self.log.info(f"[CFG] Adding missing section: {section}")
+            for setting, value_type in settings.items():
+                if not self.parser.has_option(section, setting):
+                    default_value = self.default_values.get(value_type, None)
+
+                    self.parser.set(section, setting, str(default_value))
+                    self.log.info(f"[CFG] Adding missing setting: {section}.{setting}")
+
+        self.write_to_file()
+
+
+
     # Handle special setting data type conversion
     # is_writing means data from a dict being writen to the config file
     # if False, it means the opposite direction
@@ -132,7 +176,7 @@ class CONFIG:
     # Sets and writes config data from a dict containing data settings
     def write(self, data):
         # Validate config data before writing
-        self.validate(data)
+        self.validate_data(data)
 
         for section in data:
             # init section if it doesn't exist yet
@@ -143,7 +187,10 @@ class CONFIG:
                 new_value = self.handle_setting(
                     section, setting, data[section][setting], True)
                 self.parser[section][setting] = str(new_value)
-        
+
+        self.write_to_file()
+
+    def write_to_file(self):
         # Write config data to file
         try:
             with open(self.config_name, 'w') as configfile:
diff --git a/modem/rigctld.py b/modem/rigctld.py
index fc4628dd..be112cdc 100644
--- a/modem/rigctld.py
+++ b/modem/rigctld.py
@@ -244,7 +244,8 @@ class radio:
 
         # Serial DCD and DTR
         if not should_ignore(config.get('serial_dcd')):
-            args += ['--set-dcd', config['serial_dcd']]
+            args += ['--dcd-type', config['serial_dcd']]
+
         if not should_ignore(config.get('serial_dtr')):
             args += ['--set-conf', f'dtr_state={config["serial_dtr"]}']
 
@@ -255,6 +256,8 @@ class radio:
             args += ['--set-conf', f'stop_bits={config["stop_bits"]}']
 
         # Fixme        #rts_state
+        # if not should_ignore(config.get('rts_state')):
+        #    args += ['--set-conf', f'stop_bits={config["rts_state"]}']
 
         # Handle custom arguments for rigctld
         # Custom args are split via ' ' so python doesn't add extranaeous quotes on windows
diff --git a/modem/server.py b/modem/server.py
index 43b4e8ee..00ef9f86 100644
--- a/modem/server.py
+++ b/modem/server.py
@@ -29,7 +29,7 @@ app = Flask(__name__)
 CORS(app)
 CORS(app, resources={r"/*": {"origins": "*"}})
 sock = Sock(app)
-MODEM_VERSION = "0.13.5-alpha"
+MODEM_VERSION = "0.13.6-alpha"
 
 # set config file to use
 def set_config():