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D6400 Error 1 Firmware update fails. Manual .chk won't 'open' on a MacBook.
Hi, I'm behind by several versions of firmware because each time I attempt to update it fails. I've seen other questions along a similar line being rectified by updating with a version inbetween firs...
you don't "open" the file. After you download it, you extract it.
Then that file gets uploaded to the router through the browser GUI.
https://kb.netgear.com/23960/How-do-I-manually-update-the-firmware-on-my-NETGEAR-router