diff --git a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/GBDevice.java b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/GBDevice.java
index 2058b61f..c309d529 100644
--- a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/GBDevice.java
+++ b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/GBDevice.java
@@ -144,6 +144,7 @@ public class GBDevice implements Parcelable {
         if (mBusyTask != null) {
             LOG.warn("Attempt to mark device as busy with: " + task + ", but is already busy with: " + mBusyTask);
         }
+        LOG.info("Mark device as busy: " + mBusyTask);
         mBusyTask = task;
     }
 
@@ -153,7 +154,9 @@ public class GBDevice implements Parcelable {
     public void unsetBusyTask() {
         if (mBusyTask == null) {
             LOG.error("Attempt to mark device as not busy anymore, but was not busy before.");
+            return;
         }
+        LOG.info("Mark device as NOT busy anymore: " + mBusyTask);
         mBusyTask = null;
     }
 
diff --git a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/miband/MiBandSupport.java b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/miband/MiBandSupport.java
index 12597601..5c980ef6 100644
--- a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/miband/MiBandSupport.java
+++ b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/miband/MiBandSupport.java
@@ -693,8 +693,11 @@ public class MiBandSupport extends AbstractBTLEDeviceSupport {
     }
 
     private boolean isActivityDataSyncFinished(byte[] value) {
+        // byte 0 is the kind of message
+        // byte 1 to 6 represent a timestamp
+        // byte 7 to 8 represent the amount of data left (0 = done)
         if (value.length == 9) {
-            if (value[0] == 0xa && value[1] == 0xf && value[2] == 5 && value[7] == 0 && value[8] == 0) {
+            if (value[0] == 0xa && value[7] == 0 && value[8] == 0) {
                 return true;
             }
         }