Note: The XOSS APP will prompt you to update when new firmware is available, it is recommended that you always keep the latest firmware.
Premise: The bike computer needs to stop recording
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Connect NAV/NAV+ to the XOSS app
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If it needs to upgrade the new firmware, it will prompt "Update"
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Tap Update Now
Firmware Upda Failed
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Quit XOSS App.
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Turn your Phone Bluetooth off/on phone settings.
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Restart XOSS App and connect to your device.
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Find the device whose name starts with DFU.
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Tap the DFU device to update.