# Lappy v0.4.3

Refines the built-in Erdos (Ordos) circuit start/finish using the privately supplied 6 October 2026 Dragy recording. The line moves about 5.5 m forward along the existing OSM route; Erdos is revision 2. Across 20 main-track crossings, maximum boundary disagreement with Dragy falls from 0.233 s to 0.012 s. This is agreement with the recording, not surveyed timing accuracy.

The route outline, 30 m gate, 20 m corridor and whole-lap-only configuration are retained. The other eight factory course files are byte-for-byte unchanged. Erdos has a new identity, so its previous PB/reference is not attached to the adjusted line. Custom courses and stored data are preserved. See [the evidence and methodology](../assets/tracks/china/ERDOS_DRAGY_REVIEW.md).

V2 Rev1.1 target, partition layout, bootloader source, timing engines, movement filter, BLE setup, UI and storage behavior retain v0.4.2 implementation. Install as an application-only update at 0x10000 after a verified backup. Historical release archives are unchanged.