If can be useful and save your time, this is my experienche with WNR1000v2:
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you need to download the Older Builds of 19.07.4, 18.06.8, 17.01.7 from this page:
Builds for NETGEAR WNR1000V2, WNR1000V2-VC, WNR612v2, WPN824N, WNR2000v3, EX2700
Because the latest 19.07.10 doesn't let you save settings and the router will boot always as factory settings. Sigh, I've lost two hours before I decide to flash 18.06.8 and solve it! -
I had an old FW, I coudn't load from it OpenWRT, so I needed to upgrade before to the latest factory FW (I used WNR1000v2-V1.1.2.60NA), then flash 18.06.8