# reloadSubsytemsStarted

> Called from SubsystemManager before reloading all XR SDK Provider packaged subsystems.

## Definition

* **Type:** Event
* **Namespace:** [UnityEngine](/engine/6000.7/script-reference/unityengine.md)
* **Assembly:** UnityEngine.SubsystemsModule

> **Warning:**
>
> **Deprecated.** Use beforeReloadSubsystems instead.
>
> **Upgrade to** [SubsystemManager.beforeReloadSubsystems](/engine/6000.7/script-reference/unityengine/subsystemmanager/beforereloadsubsystems.md)

```csharp
public static event Action reloadSubsytemsStarted
```

### Remarks

When the Editor starts or when packages are installed or removed, the [SubsystemManager](/engine/6000.7/script-reference/unityengine/subsystemmanager.md) searches the packages and loads all XR SDK packages that it finds. Handling this event allows the user to do work they may need prior to the subsystem manager cleaning up any current subsystem descriptors.

"Note:" This is deprecated, use [\_beforeReloadSubsystems](/engine/6000.7/script-reference/unityengine/subsystemmanager/beforereloadsubsystems.md) instead.

Additional Resources: [SubsystemManager](/engine/6000.7/script-reference/unityengine/subsystemmanager.md), [SubsystemDescriptor](/engine/6000.7/script-reference/unityengine/subsystemdescriptor.md)