What common feature is associated with over-the-air firmware updates for IoT devices?

Over-the-air (OTA) firmware updates for IoT devices enable the seamless deployment of firmware improvements and bug fixes without the need for physical access to the device. The key feature associated with this process is that firmware versions are uniquely identified for each device. This unique identification ensures that the correct firmware is applied to the appropriate device version, accounting for variations in hardware or prior updates.

Having unique identifiers for firmware versions is crucial in maintaining compatibility and functionality, as it allows the IoT device to determine which firmware version is valid and necessary. This practice minimizes the risk of installation errors and ensures that devices operate as intended, especially within diverse environments where various models and their respective firmware may exist.

The other options do not accurately describe the core function of OTA updates. For instance, firmware is typically pushed from a centralized server rather than downloaded directly from user devices, and devices commonly have storage limits that require considerations for backups. Additionally, some implementation steps are often necessary to ensure secure and successful firmware updates, which contradicts the notion that no special instructions are needed.