diff --git a/app/release/app-release-4.1.8.apk b/app/release/app-release-4.1.9.apk
similarity index 89%
rename from app/release/app-release-4.1.8.apk
rename to app/release/app-release-4.1.9.apk
index 276b1b2..803d40c 100644
Binary files a/app/release/app-release-4.1.8.apk and b/app/release/app-release-4.1.9.apk differ
diff --git a/app/src/main/java/uk/org/openseizuredetector/SdDataSourcePhone.java b/app/src/main/java/uk/org/openseizuredetector/SdDataSourcePhone.java
index 48abb03..e505897 100644
--- a/app/src/main/java/uk/org/openseizuredetector/SdDataSourcePhone.java
+++ b/app/src/main/java/uk/org/openseizuredetector/SdDataSourcePhone.java
@@ -151,6 +151,10 @@ public class SdDataSourcePhone extends SdDataSource implements SensorEventListen
                         //Log.v(TAG,"i="+i+", rawData="+mSdData.rawData[i]+","+mSdData.rawData[i/2]);
                     }
                     mSdData.mNsamp /= 2;
+
+                    // Set HR and O2Sat values to fault value (-1) to avoid alarms if the user enables HR or O2Sat alarms.
+                    mSdData.mHR = -1;
+                    mSdData.mO2Sat = -1;
                     doAnalysis();
                     mSdData.mNsamp = 0;
                     mStartTs = event.timestamp;
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 0caf0b8..280398b 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -3,10 +3,9 @@
     <string name="app_name">OpenSeizureDetector</string>
     <string name="changelog">
         "\n
-        \nV4.1.x - Added Machine Learning (Artificial Intelligence) Detection Algorithm Option (CNN V0.24).
-        Added Polish Translations by Jacek Błoniarz-Łuczak.
-        Added an Export Data function to save data to a file.
-        Added adaptive heart rate alarms.
+        \nV4.1.9 - Fixed problem with average heart rate alarm
+        Fixed issue with phone data source generating continuous alarms for Heart Rate or O2Sat
+        Fixed a small number of user reported issues (https://github.com/OpenSeizureDetector/Android_Pebble_SD/issues?q=is%3Aissue+milestone%3AV4.1.8)
           "</string>
     <string name="UpgradeMsg">
         Please enable the new &lt;b>Data Sharing&lt;/b> feature to help improve OpenSeizureDetector!&lt;br/>