Is your flashing SD unsuccessful?
If the flash SD card is unsuccessful, it means that the TF card is not recognized or the contact is poor, please check the below information.1. Reformat the TF card and copy the firmware of the correct model2. Press the TF card slot with your hand to ensure good contact3. Clean up the dust and other debris from the TF card slot4. If there is a problem with the TF card itself, replace a good TF card
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