Which AWS service can be used to update the firmware of IoT devices?

• A. AWS IoT Core
• B. AWS IoT Device Management
• C. Amazon API Gateway
• D. Amazon AppStream 2.0

Answer: (B)

Updating firmware across a fleet of IoT devices is a use case for over-the-air (OTA) deployments, where you orchestrate software updates remotely. AWS IoT Device Management provides this capability through OTA updates (Jobs). You store the firmware image in S3, create an OTA update, and target devices by thing or group. The service handles distributing the new firmware, monitoring progress, and collecting status from devices as they install, with options to roll back if needed. This fleet-wide orchestration is exactly what you need for firmware updates.

AWS IoT Core handles secure connectivity, messaging, and device shadows, but it doesn’t offer built-in OTA fleet update orchestration. API Gateway is for exposing APIs, and AppStream 2.0 is for streaming applications to users, not managing firmware on IoT devices.