diff --git a/pump/medtrum/src/main/java/info/nightscout/pump/medtrum/util/MedtrumSnUtil.kt b/pump/medtrum/src/main/java/info/nightscout/pump/medtrum/util/MedtrumSnUtil.kt
index 7f133abbfa..8f21aeef52 100644
--- a/pump/medtrum/src/main/java/info/nightscout/pump/medtrum/util/MedtrumSnUtil.kt
+++ b/pump/medtrum/src/main/java/info/nightscout/pump/medtrum/util/MedtrumSnUtil.kt
@@ -6,6 +6,9 @@ import info.nightscout.pump.medtrum.encryption.Crypt
 class MedtrumSnUtil {
 
     fun getDeviceTypeFromSerial(serial: Long): ModelType {
+        if (serial in 106000000..106999999) {
+            return ModelType.INVALID
+        }
 
         return when (Crypt().simpleDecrypt(serial)) {
             in 126000000..126999999 -> ModelType.MD0201