2.
Turn on the checkbox by tapping the device name ([1. Wi-Fi], [2. Bluetooth], [3. WWAN] (certain models only), [4. GPS], [5. External SD], [6. USB storage], [7. Ethernet]) that you want to diagnose.
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To diagnose a microSD card or USB storage device, insert the microSD card or USB storage device into the unit. Back up any important data in the microSD card or USB storage device before diagnosis.