There were some hints that support might be dropped for the original Apple Watch, including warnings in later watchOS 4 updates after Apple stopped supporting the watchOS 1 SDK.
watchOS 5 will be able to be installed on Series 1, Series 2, and Series 3 Apple Watch models, while original Apple Watch models will not be able to be upgraded beyond watchOS 4.
The original Apple Watch likely does not have the power and battery life necessary for some of the newer watchOS 5 features, including Walkie-Talkie for touch-to-talk communications with friends, richer interactive notifications, automatic workout detection, and updates to the Siri watch face.
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