1 files changed, 4 insertions, 2 deletions
diff --git a/downloader/downloader.py b/downloader/downloader.py
index f90eced..b85326f 100755
--- a/downloader/downloader.py
+++ b/downloader/downloader.py
@@ -108,9 +108,11 @@ def exec_command(dev, cmd, param, answer):
                      5: "address invalid", 6: "address prohibited",
                      7: "value out of bounds" }
 
-    cstr = bytearray(struct.pack('<BB', cmd, 0) + param)
+    dev.flushInput()
+    dev.flushOutput()
+
+    cstr = bytearray(struct.pack('<BB', cmd, len(param)+3) + param)
     cstr.extend(struct.pack("<B", calc_csum(cstr)))
-    cstr[1] = len(cstr)
     dev.write(cstr)
 
     astr = bytearray()