# Install backend

- **Method:** `POST`
- **Path:** `/api/v1/setup/start`
- **Operation ID:** `setup_start_api_v1_setup_start_post`
- **Tags:** Setup

Start background installation of the chosen compute backend (mlx/cuda/cpu).

## Effective servers

- `http://127.0.0.1:8100`

  Voice Creator Pro on this computer

## Query parameters

- **`backend` (required)**: `string`

  Backend to install: 'mlx', 'cuda', or 'cpu'

## Responses

### 200 Successful Response

**Content type:** `application/json`

schema: `SetupStartResponse`

- **`started` (required)**: `boolean`

  Whether the installation was started
- **`immediate`**: `boolean`, default: `false`

  Whether the installation completed immediately

**Example:**

```json
{
  "started": true,
  "immediate": false
}
```

### 422 Validation Error

**Content type:** `application/json`

schema: `HTTPValidationError`

- **`detail`**: `array`

  **Items:**

  schema: `ValidationError`
  - **`loc` (required)**: `array of (string | integer)`
  - **`msg` (required)**: `string`
  - **`type` (required)**: `string`
  - **`ctx`**: `object`
  - **`input`**: `any`

**Example:**

```json
{
  "detail": [
    {
      "loc": [
        ""
      ],
      "msg": "",
      "type": "",
      "input": null,
      "ctx": {}
    }
  ]
}
```

## Schemas

- `HTTPValidationError` — shown above.
- `SetupStartResponse` — shown above.
- `ValidationError` — shown above.