FYI, the current ath79 wndr3800 snapshot returns this on wndr3800ch:
sysupgrade -v /tmp/openwrt-ath79-generic-netgear_wndr3800-squashfs-sysupgrade.bin
Device wndr3700 not supported by this image
Supported devices: netgear,wndr3800 wndr3800
Image check 'fwtool_check_image' failed.
Is it advisable to use the -F option, as suggested in this previous thread? Porting guide ar71xx to ath79?