I have a spare Netgear 3500L v1 that I was trying to flash to an updated Shibby build but the ones I tried failed with "File is too big to fit..." The ones I tried were tomato-K26USB-1.28.RT-N5x-MIPSR2-121-Big-VPN and tomato-K26USB-1.28.RT-MIPSR2-121-BT-VPN. I have not yet tried others, will do so when I can. If I remember correctly the 3500L has 8MB? Those builds look like they're under 8MB? BTW, the router is currently on the very old tomato from tomatousb.org. Thanks!