diff --git a/ltchiptool/soc/ln882h/util/ln882htool.py b/ltchiptool/soc/ln882h/util/ln882htool.py
index 99f5381..8a08af6 100644
--- a/ltchiptool/soc/ln882h/util/ln882htool.py
+++ b/ltchiptool/soc/ln882h/util/ln882htool.py
@@ -208,7 +208,7 @@ def flash_write(
 
         # Convert stream to temporary file before sending with YMODEM
         with NamedTemporaryFile(delete=False) as f:
-            f.write(stream.getbuffer())
+            f.write(stream.read())
 
         self.command(f"upgrade", waitresp=False)