diff --git a/tinytuya/scanner.py b/tinytuya/scanner.py
index 2b214cd..a5772ef 100644
--- a/tinytuya/scanner.py
+++ b/tinytuya/scanner.py
@@ -529,6 +529,7 @@ def read_data( self ):
                     prefix_offset = data.find(tinytuya.PREFIX_BIN)
                     if prefix_offset >= 0:
                         data = data[prefix_offset:]
+                        self.try_v35 = False
                     elif self.try_v35 and self.deviceinfo['version'] == 3.4:
                         prefix_offset = data.find(tinytuya.PREFIX_6699_BIN)
                         if prefix_offset >= 0: