(The shortcomings of ADSL require a certain amount of experience. The general principle is: pay attention to the indicator lights and error messages, hardware first, then software, internal first, then external, first local and then external network, first try the host and then check the customer, and then report after a full review. The declaration of shortcomings should be accurate and concise, and should try to match the problems encountered with the shortcomings mentioned in the user manual)
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