The DIR-825 arrived 3 days after my order, and ship-retail-packaged just right. The instruction is pretty straightforward based on the items included: router, "blue" Cat-5 cable, mounting stand, wood screw fasteners, "start here" printed materials, and install disc.

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note: to ensure your product has the latest security updates and operates at optimal performance, it is recommended you update your product to the latest firmware after installation and to periodically check for new firmware releases. updates can be found by searching your model name at https://support.dlink.com or though the mydlink mobile applications for mydlink registered devices.

DD-WRT Forum :: View topic - DIR-825 B1 router firmware May 06, 2018 D-Link Technical Support

D-Link Xtreme N Dual Band Gigabit Router DIR-825 - CNET

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