diff --git a/apps/bthrm/settings.js b/apps/bthrm/settings.js
index 8887ee81e..4661f223f 100644
--- a/apps/bthrm/settings.js
+++ b/apps/bthrm/settings.js
@@ -17,6 +17,15 @@
   var settings;
   readSettings();
 
+  function applyCustomSettings(){
+    writeSettings("enabled",true);
+    writeSettings("replace",settings.custom_replace);
+    writeSettings("debuglog",settings.custom_debuglog);
+    writeSettings("startWithHrm",settings.custom_startWithHrm);
+    writeSettings("allowFallback",settings.custom_allowFallback);
+    writeSettings("fallbackTimeout",settings.custom_fallbackTimeout);
+  }
+
   function buildMainMenu(){
     var mainmenu = {
       '': { 'title': 'Bluetooth HRM' },
@@ -48,12 +57,7 @@
               writeSettings("allowFallback",false);
               break;
             case 3:
-              writeSettings("enabled",true);
-              writeSettings("replace",settings.custom_replace);
-              writeSettings("debuglog",settings.custom_debuglog);
-              writeSettings("startWithHrm",settings.custom_startWithHrm);
-              writeSettings("allowFallback",settings.custom_allowFallback);
-              writeSettings("fallbackTimeout",settings.custom_fallbackTimeout);
+              applyCustomSettings();
               break;
           }
           writeSettings("mode",v);
@@ -141,6 +145,7 @@
       format: v => settings.custom_replace ? "On" : "Off",
       onchange: v => {
         writeSettings("custom_replace",v);
+        if (settings.mode == 3) applyCustomSettings();
       }
     },
     'Start w. HRM': {
@@ -148,6 +153,7 @@
       format: v => settings.custom_startWithHrm ? "On" : "Off",
       onchange: v => {
         writeSettings("custom_startWithHrm",v);
+        if (settings.mode == 3) applyCustomSettings();
       }
     },
     'HRM Fallback': {
@@ -155,6 +161,7 @@
       format: v => settings.custom_allowFallback ? "On" : "Off",
       onchange: v => {
         writeSettings("custom_allowFallback",v);
+        if (settings.mode == 3) applyCustomSettings();
       }
     },
     'Fallback Timeout': {
@@ -165,6 +172,7 @@
       format: v=>v+"s",
       onchange: v => {
         writeSettings("custom_fallbackTimout",v*1000);
+        if (settings.mode == 3) applyCustomSettings();
       }
     },
   };