diff --git a/chirp/drivers/uvk5.py b/chirp/drivers/uvk5.py
index 7413128c..ee11196a 100644
--- a/chirp/drivers/uvk5.py
+++ b/chirp/drivers/uvk5.py
@@ -2062,7 +2062,7 @@ class UVK5Radio(UVK5RadioBase):
     @classmethod
     def k5_approve_firmware(cls, firmware):
         approved_prefixes = ('k5_2.01.', 'app_2.01.', '2.01.',
-                             '1o11')
+                             '1o11', '4.00.')
         return any(firmware.startswith(x) for x in approved_prefixes)
 
     @classmethod