diff --git a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/devices/AbstractSampleProvider.java b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/devices/AbstractSampleProvider.java
index 4df87cc4..127df254 100644
--- a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/devices/AbstractSampleProvider.java
+++ b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/devices/AbstractSampleProvider.java
@@ -98,15 +98,21 @@ public abstract class AbstractSampleProvider<T extends AbstractActivitySample> i
 //
 
     public void changeStoredSamplesType(int timestampFrom, int timestampTo, int kind) {
-        // TODO: implement
+        List<T> samples = getAllActivitySamples(timestampFrom, timestampTo);
+        for (T sample : samples) {
+            sample.setRawKind(kind);
+        }
+        getSampleDao().updateInTx(samples);
     }
 
     public void changeStoredSamplesType(int timestampFrom, int timestampTo, int fromKind, int toKind) {
-        // TODO: implement
+        List<T> samples = getGBActivitySamples(timestampFrom, timestampTo, fromKind);
+        for (T sample : samples) {
+            sample.setRawKind(toKind);
+        }
+        getSampleDao().updateInTx(samples);
     }
 
-////    SQLiteDatabase getWritableDatabase();
-
     protected List<T> getGBActivitySamples(int timestamp_from, int timestamp_to, int activityType) {
         QueryBuilder<T> qb = getSampleDao().queryBuilder();
         qb.where(MiBandActivitySampleDao.Properties.Timestamp.ge(timestamp_from))
diff --git a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/entities/AbstractActivitySample.java b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/entities/AbstractActivitySample.java
index 81474e5b..e9956665 100644
--- a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/entities/AbstractActivitySample.java
+++ b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/entities/AbstractActivitySample.java
@@ -26,6 +26,10 @@ public abstract class AbstractActivitySample implements ActivitySample {
         return getProvider().normalizeIntensity(getRawIntensity());
     }
 
+    public abstract void setRawKind(int kind);
+
+    public abstract void setRawIntensity(int intensity);
+
     @Override
     public String toString() {
         return getClass().getSimpleName() + "{" +