Model WNDR3700-TOMATE-VPN-DDWRT

Hello, J' have currently a débrick to make on my WNR3500L… (following MAJ of the firmeware KB) While waiting for cable FTDI TTL- 232R- 3V3… I would wish to have specified out of tomato and VPN (openvpn) on router NETGEAR WNDR3700. It seems to have 2 remote loading of which one recommended but that appears vague to me… could one m' to light? thank you