diff --git a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/miband/AbstractMi1FirmwareInfo.java b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/miband/AbstractMi1FirmwareInfo.java
index cf626593..3e423641 100644
--- a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/miband/AbstractMi1FirmwareInfo.java
+++ b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/miband/AbstractMi1FirmwareInfo.java
@@ -52,16 +52,22 @@ public abstract class AbstractMi1FirmwareInfo extends AbstractMiFirmwareInfo {
     @Override
     protected boolean isGenerallySupportedFirmware() {
         if (!isSingleMiBandFirmware()) {
+            LOG.warn("not a single firmware");
             return false;
         }
         try {
             int majorVersion = getFirmwareVersionMajor();
-            return majorVersion == getSupportedMajorVersion();
-        } catch (IllegalArgumentException e) {
-            return false;
+            if (majorVersion == getSupportedMajorVersion()) {
+                return true;
+            } else {
+                LOG.info("Only major version " + getSupportedMajorVersion() + " is supported: " + majorVersion);
+            }
+        } catch (IllegalArgumentException ex) {
+            LOG.warn("invalid firmware or bug: " + ex.getLocalizedMessage(), ex);
         } catch (IndexOutOfBoundsException ex) {
-            return false;
+            LOG.warn("not supported firmware: " + ex.getLocalizedMessage(), ex);
         }
+        return false;
     }
 
     protected abstract int getSupportedMajorVersion();
diff --git a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/miband/Mi1SFirmwareInfo.java b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/miband/Mi1SFirmwareInfo.java
index c9301b90..058bfb43 100644
--- a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/miband/Mi1SFirmwareInfo.java
+++ b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/miband/Mi1SFirmwareInfo.java
@@ -10,7 +10,7 @@ import org.slf4j.LoggerFactory;
  * FW2 is heartrate firmware
  */
 public class Mi1SFirmwareInfo extends AbstractMi1SFirmwareInfo {
-    private static final Logger LOG = LoggerFactory.getLogger(AbstractMi1FirmwareInfo.class);
+    private static final Logger LOG = LoggerFactory.getLogger(Mi1SFirmwareInfo.class);
 
     private final Mi1SFirmwareInfoFW1 fw1Info;
     private final Mi1SFirmwareInfoFW2 fw2Info;
@@ -53,9 +53,10 @@ public class Mi1SFirmwareInfo extends AbstractMi1SFirmwareInfo {
                     && fw1Info.getFirmwareBytes().length > 0
                     && fw2Info.getFirmwareBytes().length > 0;
         } catch (IndexOutOfBoundsException ex) {
+            LOG.warn("invalid firmware or bug: " + ex.getLocalizedMessage(), ex);
             return false;
         } catch (IllegalArgumentException ex) {
-            LOG.warn("not supported 1S firmware: ", ex);
+            LOG.warn("not supported 1S firmware: " + ex.getLocalizedMessage(), ex);
             return false;
         }
     }
diff --git a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/miband/Mi1SFirmwareInfoFW1.java b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/miband/Mi1SFirmwareInfoFW1.java
index b8ea7aab..9bb5e572 100644
--- a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/miband/Mi1SFirmwareInfoFW1.java
+++ b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/miband/Mi1SFirmwareInfoFW1.java
@@ -2,12 +2,15 @@ package nodomain.freeyourgadget.gadgetbridge.service.devices.miband;
 
 import android.support.annotation.NonNull;
 
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
 /**
  * FW1 is Mi Band firmware
  * FW2 is heartrate firmware
  */
 public class Mi1SFirmwareInfoFW1 extends AbstractMi1SFirmwareInfo {
-
+    private static final Logger LOG = LoggerFactory.getLogger(Mi1SFirmwareInfoFW1.class);
     private static final int MI1S_FW_BASE_OFFSET = 1092;
 
     Mi1SFirmwareInfoFW1(@NonNull byte[] wholeFirmwareBytes) {
@@ -42,9 +45,14 @@ public class Mi1SFirmwareInfoFW1 extends AbstractMi1SFirmwareInfo {
     protected boolean isGenerallySupportedFirmware() {
         try {
             int majorVersion = getFirmwareVersionMajor();
-            return majorVersion == 4;
-        } catch (IllegalArgumentException e) {
-            return false;
+            if (majorVersion == 4) {
+                return true;
+            } else {
+                LOG.warn("Only major version 4 is supported for 1S fw1: " + majorVersion);
+            }
+        } catch (IllegalArgumentException ex) {
+            LOG.warn("not supported 1S firmware 1: " + ex.getLocalizedMessage(), ex);
         }
+        return false;
     }
 }
diff --git a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/miband/Mi1SFirmwareInfoFW2.java b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/miband/Mi1SFirmwareInfoFW2.java
index 9cd013f7..38484f7b 100644
--- a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/miband/Mi1SFirmwareInfoFW2.java
+++ b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/miband/Mi1SFirmwareInfoFW2.java
@@ -2,11 +2,15 @@ package nodomain.freeyourgadget.gadgetbridge.service.devices.miband;
 
 import android.support.annotation.NonNull;
 
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
 /**
  * FW1 is Mi Band firmware
  * FW2 is heartrate firmware
  */
 public class Mi1SFirmwareInfoFW2 extends AbstractMi1SFirmwareInfo {
+    private static final Logger LOG = LoggerFactory.getLogger(Mi1SFirmwareInfoFW2.class);
 
     Mi1SFirmwareInfoFW2(@NonNull byte[] wholeFirmwareBytes) {
         super(wholeFirmwareBytes);
@@ -32,10 +36,15 @@ public class Mi1SFirmwareInfoFW2 extends AbstractMi1SFirmwareInfo {
     protected boolean isGenerallySupportedFirmware() {
         try {
             int majorVersion = getFirmwareVersionMajor();
-            return majorVersion == 1;
-        } catch (IllegalArgumentException e) {
-            return false;
+            if (majorVersion == 1) {
+                return true;
+            } else {
+                LOG.warn("Only major version 1 is supported for 1S fw2: " + majorVersion);
+            }
+        } catch (IllegalArgumentException ex) {
+            LOG.warn("not supported 1S firmware 2: " + ex.getLocalizedMessage(), ex);
         }
+        return false;
     }
 
     @Override