# Restart device

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This command is available for devices with firmware version ≥ 1.3.
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Restart the device, causing it to power cycle, and initiate a new join procedure.

<table><thead><tr><th width="153"></th><th></th></tr></thead><tbody><tr><td><strong>Byte index</strong></td><td><strong>Hex value – Meaning</strong></td></tr><tr><td>0</td><td>A5 – The command code.</td></tr></tbody></table>

**Example downlink**: 0xA5

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The following mechanic only applies for devices with firmware version ≥ 2.4.
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If the command is sent via an **unconfirmed downlink**, the device starts a 20-second delay period, after which it restarts.

If the command is sent via a **confirmed downlink**, the device transmits an acknowledgment uplink, then starts the 20 second delay period, after which it restarts.