I purchased a second-hand Linksys WRT1900AC wireless router from some guy online. Is it safe to just hard-reset, plug in and configure? As far as I understand, it is a highly-customizable device which could potentially be running a modified firmware with some malicious functionality, like some sort of spyware. How hard/easy is it to install the "original" firmware on it?
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Is it safe to just hard-reset, plug in and configure?
Hard reset only erases settings of the device, the firmware left untouched.
How hard/easy is it to install the "original" firmware on it?
It depends of the installed firmware. Actually it is not hard task, there are a lot of manuals on the internet.
Anyway, I would recommend to reinstall firmware if it is not origin.

Gnat
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