Samsung Galaxy Watch 4 and 4 Classic miss One UI 9 update
Samsung will not release the new One UI 9 Watch operating system to its Galaxy Watch 4 and Galaxy Watch 4 Classic models.

Devices excluded from the latest software
The company has confirmed that the Galaxy Watch 4 lineup released in 2021 will not receive the update. These specific older devices are now too old to get the latest operating system. The list of unsupported watches is described as mercifully small by the outlet.
Support limits for newer models
Samsung has increased software support for the Galaxy Watch 9 and Galaxy Watch Ultra 2 to five major upgrades. Their predecessors in the lineup only receive four updates before becoming unsupported. Most previous devices will eventually get the update, but some are now excluded.
Impact on features and security
The lack of the new software means these watches will not get bug fixes or new features. Security updates will also stop coming to the unsupported older models. Future app compatibility remains a question mark for users of these specific devices.
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