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Le Mans Ultimate Rolls Back Netcode Changes in Hotfix 1.4.1.3

Studio 397 has released a hotfix for Le Mans Ultimate, rolling back network changes following widespread multiplayer stability issues introduced in version 1.4.

20 August 2026

Studio 397 has deployed hotfix 1.4.1.3 for Le Mans Ultimate, addressing urgent multiplayer issues reported by the community following the release of update 1.4.

The recent 1.4 update included revisions to the simulator's netcode and RaceControl backend. However, the rollout proved problematic for many players, leading to severe disruptions such as server freezes, unstable connections, and inconsistent online synchronization during races. The severity of these connectivity issues prompted organizers of high-level competitive leagues to temporarily suspend events.

In response, the developers have partially reverted the networking system to its pre-1.4 state in hotfix 1.4.1.3. While the newly introduced RUDP protocol has not been completely discarded, Studio 397 acknowledged that it requires further refinement. The studio plans to continue testing the protocol on dedicated test servers to avoid disrupting the stability of the public multiplayer service.

Beyond the netcode rollback, hotfix 1.4.1.3 resolves a specific bug responsible for server freezes, removes engineer radio notifications triggered after the completion of an event, and introduces diagnostic logging for brake duct parameters.