diff --git a/src/NanoVNASaver/Hardware/NanoVNA_V2.py b/src/NanoVNASaver/Hardware/NanoVNA_V2.py
index d9b8c1b..4af3e0b 100644
--- a/src/NanoVNASaver/Hardware/NanoVNA_V2.py
+++ b/src/NanoVNASaver/Hardware/NanoVNA_V2.py
@@ -85,7 +85,7 @@ class NanoVNA_V2(VNA):
             sleep(WRITE_SLEEP)
 
         # firmware major version of 0xff indicates dfu mode
-        if self.version.data["major"] == 0xFF:
+        if self.version.major == 0xFF:
             raise IOError("Device is in DFU mode")
 
         if "S21 hack" in self.features:
diff --git a/src/NanoVNASaver/Settings/Sweep.py b/src/NanoVNASaver/Settings/Sweep.py
index d5aef9e..58335bc 100644
--- a/src/NanoVNASaver/Settings/Sweep.py
+++ b/src/NanoVNASaver/Settings/Sweep.py
@@ -32,7 +32,7 @@ class SweepMode(Enum):
     AVERAGE = 2
 
 
-class Properties(NamedTuple):
+class Properties:
     name: str = ""
     mode: "SweepMode" = SweepMode.SINGLE
     averages: tuple[int, int] = (3, 0)