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Classification target is Xiaomi Redmi Watch 5 Active. The most material evidence is the Byterialab GitHub repository (published 2026-02-11), which documents OOB memory reads via crafted watchface files, DoS payloads, and SSL-pinning bypass scripts for the Mi Fitness app, and the ACM Web Conference 2025 case study that independently tested the device’s access security, brute-force resistance, Bluetooth security, and update mechanisms and found it “only meets basic requirements and relies on the user’s initiative.” The device runs RT-Thread RTOS on ARM Cortex-M33, not Android/Wear OS, which changes the hardware-tampering and update-policy assessment logic. Authentication = Basic and Brute-force protection = Basic are directly supported by the case study’s findings. Updatability = Rare because Xiaomi has not published a binding security-update cadence, and the case study’s update-mechanism testing found the protection to be basic.
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