Post-July-2025 Echelon firmware gates BLE telemetry behind a challenge/response handshake. The bike sends an 8-byte F0 E0 challenge and expects a 128-bit rolling key derived from a master key held on Echelon's servers, so the answer cannot be computed in the browser. To ride with this page, either use a bike whose firmware predates the lockdown, or capture one key frame from the official app's handshake (BLE sniffer or a QZ "Virtual Echelon" bridge) and replay it here — keys are single-use and expire quickly.