How to restore with Original(Factory) firmware?

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heo mu won
heo mu won's picture
How to restore with Original(Factory) firmware?
Hi
I have a Nighthawk R8500 with 

DD-WRT Kong Mod for NETGEAR R8500 (2017-11-04 CHK) installed.

I would like to remove that firmware and restore to a factory(Original) firmware.
I followed this link  to restore the firmware without luck.
I would appreciate some help.
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