fix admin user persm

devices/serializers.py

@@ -1,5 +1,5 @@
 from rest_framework import serializers
-from .models import Device
+from .models import Device, normalize_mac
 from api.serializers import CustomReadOnlyUserSerializer
 from billing.models import Payment  # Import the Payment model
 
@@ -8,6 +8,9 @@ class CreateDeviceSerializer(serializers.ModelSerializer):
     name = serializers.CharField(required=True)
     mac = serializers.CharField(required=True)
 
+    def validate_mac(self, value):
+        return normalize_mac(value)
+
     class Meta:  # type: ignore
         model = Device
         fields = [