KNFs can be on-boarded using Helm Charts or Juju Bundles. In the following section is shown an example with Helm Chart and for Juju Bundles.
KNFs can be on-boarded using Helm Charts or Juju Bundles. In this section, examples with Helm Chart and Juju Bundles are shown.
#### Note about deprecation of Helm v2
Helm v2 has been deprecated since 2020. Starting from OSM Release FIFTEEN, OSM no longer supports Helm v2. If the end user tries to deploy a KNF using Helm v2, the following error will be found:
```log
ERROR: Error 422: {
"code": "UNPROCESSABLE_ENTITY",
"status": 422,
"detail": "Error in pyangbind validation: {'error-string': 'helm_version must be of a type compatible with enumeration', 'defined-type': 'kdu:enumeration', 'generated-type': 'YANGDynClass(base=RestrictedClassType(base_type=six.text_type, restriction_type=\"dict_key\", restriction_arg={\\'v3\\': {}},), default=six.text_type(\"v3\"), is_leaf=True, yang_name=\"helm-version\", parent=self, choice=(\\'kdu-model\\', \\'helm-chart\\'), path_helper=self._path_helper, extmethods=self._extmethods, register_paths=True, namespace=\\'urn:etsi:osm:yang:augments:kdu\\', defining_module=\\'kdu\\', yang_type=\\'enumeration\\', is_config=True)'}"
}
```
If you are the KNF provider and want to upgrade a helm chart from v2 to v3, follow the [official documentation](https://helm.sh/docs/topics/v2_v3_migration/)
