Hi Minh good day,
Please can you follow the below instructions and return the complete unit, including packaging and any accessories.
Thank you for submitting your return request. An RMA (Return Merchandise Authorization) has been created for your order.
You should receive an email shortly at the address associated with your order. This email will contain:
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Your RMA number
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A link to our RMA form
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Instructions for completing the return process
Please check your inbox (and spam folder) for this email. If you don’t receive it within the next hour, please let us know here.
Remember to complete the RMA form and initiate your return within 30 days. If you have any questions, feel free to ask them in this thread
Regards,
David
Unmanned Tech Support