diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
new file mode 100644
index 000000000..69aa0ab3d
--- /dev/null
+++ b/CONTRIBUTING.md
@@ -0,0 +1,9 @@
+Contributing to BangleApps
+==========================
+
+https://github.com/espruino/BangleApps?tab=readme-ov-file#getting-started
+has some links to tutorials on developing for Bangle.js.
+
+Please check out the Wiki to get an idea what sort of things
+we'd like to see for contributed apps: https://github.com/espruino/BangleApps/wiki/App-Contribution
+
diff --git a/apps/bthome/ChangeLog b/apps/bthome/ChangeLog
index f5ea96ca1..ca91e0f34 100644
--- a/apps/bthome/ChangeLog
+++ b/apps/bthome/ChangeLog
@@ -1,4 +1,5 @@
 0.01: New App!
 0.02: Fix double-button press if you press the next button within 30s (#3243)
 0.03: Cope with identical duplicate buttons (fix #3260)
-      Set 'n' for buttons in Bangle.btHomeData correctly (avoids adding extra buttons on end of advertising)
\ No newline at end of file
+      Set 'n' for buttons in Bangle.btHomeData correctly (avoids adding extra buttons on end of advertising)
+0.04: Fix duplicate button on edit->save
\ No newline at end of file
diff --git a/apps/bthome/metadata.json b/apps/bthome/metadata.json
index acc1f5b39..1ccc19316 100644
--- a/apps/bthome/metadata.json
+++ b/apps/bthome/metadata.json
@@ -1,7 +1,7 @@
 { "id": "bthome",
   "name": "BTHome",
   "shortName":"BTHome",
-  "version":"0.03",
+  "version":"0.04",
   "description": "Allow your Bangle to advertise with BTHome and send events to Home Assistant via Bluetooth",
   "icon": "icon.png",
   "type": "app",
diff --git a/apps/bthome/settings.js b/apps/bthome/settings.js
index 4c84d99de..1bdcb270d 100644
--- a/apps/bthome/settings.js
+++ b/apps/bthome/settings.js
@@ -1,7 +1,11 @@
 (function(back) {
-  var settings = require("Storage").readJSON("bthome.json",1)||{};
-  if (!(settings.buttons instanceof Array))
-    settings.buttons = [];
+  var settings;
+
+  function loadSettings() {
+    settings = require("Storage").readJSON("bthome.json",1)||{};
+    if (!(settings.buttons instanceof Array))
+      settings.buttons = [];
+  }
 
   function saveSettings() {
     require("Storage").writeJSON("bthome.json",settings)
@@ -15,7 +19,10 @@
     }
     var actions = ["press","double_press","triple_press","long_press","long_double_press","long_triple_press"];
     var menu = {
-      "":{title:isNew ? /*LANG*/"New Button" : /*LANG*/"Edit Button", back:showMenu},
+      "":{title:isNew ? /*LANG*/"New Button" : /*LANG*/"Edit Button", back: () => {
+        loadSettings(); // revert changes
+        showMenu();
+      }},
       /*LANG*/"Icon" : {
         value : "\0"+require("icons").getIcon(button.icon),
         onchange : () => {
@@ -49,7 +56,7 @@
         onchange : v => button.n=v
       },
       /*LANG*/"Save" : () => {
-        settings.buttons.push(button);
+        if (isNew) settings.buttons.push(button);
         saveSettings();
         showMenu();
       }
@@ -94,5 +101,7 @@
     });
     E.showMenu(menu);
   }
+
+  loadSettings();
   showMenu();
 })
\ No newline at end of file
diff --git a/core b/core
index b4224cd34..1deedec58 160000
--- a/core
+++ b/core
@@ -1 +1 @@
-Subproject commit b4224cd348304016dc42d5dda6501e4e95c6b5ce
+Subproject commit 1deedec58cdb854da978e54f10e7e4755b35302e
diff --git a/webtools b/webtools
index 3a5543818..8150b3617 160000
--- a/webtools
+++ b/webtools
@@ -1 +1 @@
-Subproject commit 3a55438189240c0f40cf280128d663806d04a5be
+Subproject commit 8150b3617766689ee77ce085c60926cc9040d6fb