# OTA update prerequisites
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**Important**  <a name="archive-message"></a>
This is an archived version of the FreeRTOS User Guide for use with FreeRTOS release 202012.00. For the latest version of this document, see the [FreeRTOS User Guide](../../../latest/userguide/index.html).

To use over-the-air (OTA) updates, do the following:
+ Check the [Prerequisites for OTA updates using HTTP](ota-http-freertos.md) or the [Prerequisites for OTA updates using MQTT](ota-mqtt-freertos.md).
+ [Create an Amazon S3 bucket to store your update](dg-ota-bucket.md).
+ [Create an OTA Update service role](create-service-role.md).
+ [Create an OTA user policy](create-ota-user-policy.md).
+ [Create a code-signing certificate](ota-code-sign-cert.md).
+ If you are using Code Signing for Amazon IoT, [Grant access to code signing for Amazon IoT](code-sign-policy.md).
+ [Download FreeRTOS with the OTA library](ota-download-freertos.md).