> 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/hardware/card-readers/mms-dyna-devices/dynaflex-ii-go/documents/developers-manuals/programmers-manual-commands/commands/security/change-device-lock-state.md).

# Change Device Lock State

## Command 0xEF06 – Change Device Lock State

The host can use this command to change the device’s lock state. To get the device’s lock state or to set it using MagTek security see **Property 1.2.5.2.1.1 Device Lock State**. The value of the device lock state will revert to the value of **Property 1.2.5.2.1.2 Device Lock State After Reset** after a reset or a power cycle. See **Device Lock Feature** for more information.

## Table - Request Data for Command 0xEF06 – Change Device Lock State

<table><thead><tr><th>Tag</th><th width="75">Len</th><th>Value / Description</th><th width="73.33331298828125">Typ</th><th width="74.6666259765625">Req</th><th width="96.6666259765625">Default</th></tr></thead><tbody><tr><td>Beginning of any wrappers, at minimum including <strong>Request Message</strong></td><td>-</td><td>-</td><td></td><td></td><td></td></tr><tr><td>EF06 = <strong>Command 0xEF06 – Change Device Lock State</strong></td><td>-</td><td></td><td></td><td></td><td></td></tr><tr><td>81</td><td>01</td><td>Device Lock State<br>- 0x00 = Unlocked<br>- 0x01 = Locked</td><td>B</td><td>M</td><td></td></tr><tr><td>82</td><td>01</td><td>Passcode Format<br>- 0x00 = Clear<br>- 0x01 = Fixed SHA-256<br>- 0x02 = Variable SHA-256</td><td>B</td><td>M</td><td></td></tr><tr><td>83</td><td>04-63</td><td><p>Passcode — The value of the passcode depends on the value of the passcode format parameter. </p><ul><li>If the passcode format is set to Clear (0x00), then the value of the passcode is the passcode in the clear and can have a length of 4–63 bytes.</li><li>If the passcode format is set to Fixed SHA-256 (0x01), then the value of the passcode is the 32-byte SHA-256 hash value of the passcode</li><li>If the passcode format is set to Variable SHA-256 (0x02), then the value of the passcode is the 32-byte SHA-256 hash value of: an 8-byte random challenge token followed by the 4–63 byte passcode. The challenge token must have been retrieved from the device within the last 5 minutes using Command 0xE001 - Get Challenge</li></ul></td><td>B</td><td>M</td><td></td></tr><tr><td>-</td><td>-</td><td>End of any wrappers, at minimum including <strong>Request Message</strong></td><td></td><td></td><td></td></tr></tbody></table>

## Table - Response Data for Command 0xEF06 – Change Device Lock State

<table><thead><tr><th width="253.33331298828125">Tag</th><th width="74">Len</th><th width="213.66668701171875">Value / Description</th><th width="73.33331298828125">Typ</th><th width="74">Req</th><th width="96.6666259765625">Default</th></tr></thead><tbody><tr><td>Beginning of any wrappers, at minimum including <strong>Response Message</strong></td><td>-</td><td></td><td></td><td></td><td></td></tr><tr><td>EF06 = <strong>Command 0xEF06 – Change Device Lock State</strong></td><td>-</td><td></td><td></td><td></td><td></td></tr><tr><td>-</td><td>-</td><td>No parameters.</td><td></td><td></td><td></td></tr><tr><td>-</td><td>-</td><td>End of any wrappers, at minimum including <strong>Response Message</strong></td><td></td><td></td><td></td></tr></tbody></table>

## Table - Request Example

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

```
AA00 81 04 0155EF06 84 0E EF06 810100 820100 8304 34333231
```

{% endcode %}

## Table - Response Example

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

```
AA00 81048255EF06 820400000000 8402EF06
```

{% endcode %}


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