diff --git a/Pico_example/Pico_read.py b/Pico_example/Pico_read.py
index e06a82d..aa36c25 100644
--- a/Pico_example/Pico_read.py
+++ b/Pico_example/Pico_read.py
@@ -42,8 +42,14 @@ try:
                     #reader.writeNTAGPage(5,data)
                     #reader.MFRC522_Dump_NTAG(uid,Start=5,End=6)
                 else:
-                    defaultKey = [255,255,255,255,255,255]
-                    reader.MFRC522_DumpClassic1K(uid,Start=0, End=64, keyA=defaultKey)
+                    (stat, tag_type) = reader.request(reader.REQIDL)
+                    if stat == reader.OK:
+                        (stat, uid2) = reader.SelectTagSN()
+                        if stat == reader.OK:
+                            if uid != uid2:
+                                continue
+                            defaultKey = [255,255,255,255,255,255]
+                            reader.MFRC522_DumpClassic1K(uid,Start=0, End=64, keyA=defaultKey)
                 PreviousCard = uid
             else:
                 pass
diff --git a/mfrc522.py b/mfrc522.py
index 1e891a3..c35bd01 100644
--- a/mfrc522.py
+++ b/mfrc522.py
@@ -472,5 +472,5 @@ class MFRC522:
                 self.NTAG= self.NTAG_216
                 self.NTAG_MaxPage = 230                  
                 return True
-        return false
+        return False