diff --git a/sec-beidou-rtcm/src/main/java/com/imdroid/sideslope/message/D3F0SelfCheckMessage.java b/sec-beidou-rtcm/src/main/java/com/imdroid/sideslope/message/D3F0SelfCheckMessage.java
index f5349457..099d6183 100644
--- a/sec-beidou-rtcm/src/main/java/com/imdroid/sideslope/message/D3F0SelfCheckMessage.java
+++ b/sec-beidou-rtcm/src/main/java/com/imdroid/sideslope/message/D3F0SelfCheckMessage.java
@@ -51,10 +51,10 @@ public class D3F0SelfCheckMessage extends BaseMessage {
         if(src.readableBytes()>=15){
             imei = src.readCharSequence(15, StandardCharsets.UTF_8).toString();
         }
-        if(src.readableBytes()>=2){
+        if(src.readableBytes()>=3){
             firmwareVersion = firmwareVersion +
                     " bVer:"+src.readUnsignedByte() +
-                    " reboot:"+src.readUnsignedByte();
+                    " reboot:"+src.readUnsignedShort();
         }
 
     }