Frequently Asked Questions
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Questions in DN41R/DN81R/DN61R
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How to extend cable?
(8154 views,Published at 2018-06-21 11:00)
How to upgrade system's firmware version?
(28328 views,Published at 2018-06-16 10:46)
How to judge if a camera can work with a recorder?
(11552 views,Published at 2018-06-21 10:59)
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