diff --git a/homekit/controller/ble_impl/__init__.py b/homekit/controller/ble_impl/__init__.py
index 53ed1e5..ce68577 100644
--- a/homekit/controller/ble_impl/__init__.py
+++ b/homekit/controller/ble_impl/__init__.py
@@ -247,7 +247,7 @@ def _convert_from_python(self, aid, cid, value):
             return value.encode('UTF-8')
 
         if char_format == CharacteristicFormats.data or char_format == CharacteristicFormats.tlv8:
-            return value.hex().encode()
+            return value
 
         # from here only integer values of different sizes
         if char_format == CharacteristicFormats.int: