Image check fails if trying to upgrade from OpenWrt 19.07.8 r11364-ef56c85848 / LuCI openwrt-19.07 branch git-21.189.23240-7b931da to the new ath79 based builds.
Model: NETGEAR WNDR3700v4 Architecture: Atheros AR9344 rev 2
Reproducible with sysupgrade from either:
Device wndr3700v4 not supported by this image Supported devices: netgear,wndr3700-v4 Invalid sysupgrade file. Image check failed.