> For the complete documentation index, see [llms.txt](https://developer.magtek.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developer.magtek.com/api-and-command-reference/scra-dynafamily-programmers-manual/commands/process-files-command-group-0xd9nn/commit-firmware-from-file-command-0xd901.md).

# Commit Firmware from File - Command 0xD901

The host uses this command to commit a file previously uploaded using Command 0xD801 - Load (Firmware File) into the device’s permanent memory after the device has authenticated the file.

Sequence of events:

{% stepper %}
{% step %}

### Compose and send request

The host composes a command request in the format below, and sends it to the device.
{% endstep %}

{% step %}

### Device acknowledges request

The device sends a response in the format below.
{% endstep %}

{% step %}

### Device writes image

The device writes the image file to permanent storage.
{% endstep %}

{% step %}

### Device notifies host and resets

If the commit operation was successful, the device sends Firmware Update Successful - Notification 0x0905 to the host. If the commit operation was not successful, the device sends Firmware Update Failed - Notification 0x0906 to the host. In both cases, the device automatically resets.
{% endstep %}
{% endstepper %}

## Table CFF-1 - Request Data for Command 0xD901 - Commit Firmware from File

<table><thead><tr><th width="182">Tag</th><th width="74.66668701171875">Len</th><th>Value / Description</th><th width="73.66668701171875">Typ</th><th width="76.66668701171875">Req</th><th width="97.333251953125">Default</th></tr></thead><tbody><tr><td>Beginning of any wrappers, at minimum including Request Message</td><td>—</td><td>—</td><td>—</td><td>—</td><td>—</td></tr><tr><td>D901</td><td>—</td><td>Command 0xD901 - Commit Firmware from File</td><td>—</td><td>—</td><td>—</td></tr><tr><td>81</td><td>01</td><td>Progress Indicator. Reserved for future use. Populate with 0x03.</td><td>B</td><td>R</td><td></td></tr><tr><td>82</td><td>01</td><td>Operation Options. Reserved for future use. Populate with 0x00.</td><td>B</td><td>R</td><td></td></tr><tr><td>85</td><td>02</td><td><p>Image Type</p><ul><li>0x0000 = Boot Loader 1 image</li><li>0x0001 = Main App image</li><li>0x0002 = WiFi Module image</li><li>0x0003 = BLE Module image </li></ul></td><td>B</td><td>R</td><td></td></tr><tr><td>86</td><td>20</td><td><p>Hash Checksum</p><p>This is a SHA-256 hash of the entire Firmware File Type object being uploaded.</p></td><td>B</td><td>R</td><td></td></tr><tr><td>End of any wrappers, at minimum including Request Message</td><td></td><td></td><td></td><td></td><td></td></tr></tbody></table>

## Table CFF-2 - Response Data for Command 0xD901 - Commit Firmware from File

| Tag                                                              | Len | Value / Description                        | Typ | Req | Default |
| ---------------------------------------------------------------- | --- | ------------------------------------------ | --- | --- | ------- |
| Beginning of any wrappers, at minimum including Response Message | —   | —                                          | —   | —   | —       |
| D901                                                             | —   | Commit Firmware from File - Command 0xD901 | —   | —   | —       |
| No parameters                                                    |     |                                            |     |     |         |
| End of any wrappers, at minimum including Response Message       |     |                                            |     |     |         |

If the request started successfully, the Request Status in the message wrapper is: OK, Started / Running, All good / requested operation was successful.

## Table CFF-3 - Request Example

{% code title="Example (Hex)" %}

```
AA 00 81 04 01 02 D9 01 84 2E D9 01 81 01 03 82 01 00 85 02 00 01 86 20 DF C7 1E 09 
A3 CE 8E 86 B0 F5 B6 75 BE B7 7A 0E 82 33 BF F1 8A CD 8F 38 34 B0 DB 20 D9 40 4B 28
```

{% endcode %}

## Table CFF-4 - Response Example

{% code title="Example (Hex)" %}

```
AA 00 81 04 82 02 D9 01 82 04 00 00 00 00
```

{% endcode %}

## Table CFF-5 - Notification Example

{% code title="Example (hex)" %}

```
AA 00 81 04 83 00 09 05 82 04 08 01 0A 03
```

{% endcode %}


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