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Netgear has set up a community forum specifically for the NightHawk RAX WiFi 6 Router products. Most of the people who watch that forum are more likely to have experience with NH router products and know how to work it better than those of us who follow this router forum. Might be more likely to find someone who has a solution if the question is posted there: https://community.netgear.com/t5/Nighthawk-Routers-with-WiFi-6-AX/bd-p/en-home-routers-nighthawk-wif...
I did exactly as you suggested and did a factory reset. Once this was completed, I was able to manually update the firmware. As this update is critical due to recent hackng, it was vital to get completed. Thanks for your guidance.
From all the forum posts, this appears to be a problem that developed in the last few years and became more widespread in the last year. There are seven requests for help on this error in the last year. This would seem to confirm that the problem is a problem at Netgear. From the error, it looks like the updater is corrupted. It's much as if a Windows or Mac OS X update was corrupted. Netgear itself has to fix the updater. However, tech support wants to charge for support to address it. There are a handful of suggestions (none apply in my case) but you're welcome to try them:
I had the same problem with the GUI language. I just went to the support page and downloaded the firmware Zip file. Then unzipped it to a folder on my desktop (in my case it was RAX50-V1.0.5.106_2.0.70.chk). Then went back into Administration Area and Firmware update and clicked Browse and directed it to the location of the update (RAX50-V1.0.5.106_2.0.70.chk).
