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There is no official public "self-service" updater for the D8 unless you contact support directly for a specific issue (e.g., TWS pairing bugs or battery display errors).
is not as seamless as modern smartphone-driven updates and typically requires a manual connection to a PC. W-king D8 Firmware Update
Click the button. The process typically takes only 5–10 seconds. There is no official public "self-service" updater for