I've recently purchased an Asus RT-N66U to replace my RT-N16 which has been spontaneously rebooting for a while. Unfortunately I'm having difficulty flashing the N66U to TomatoUSB based firmware. I have tried the following versions, all flashing through the Asus recovery tool: tomato-K26USB-NVRAM64K-1.28.0501.3MIPSR2Toastman-RT-N-VLAN-VPN-NOCAT tomato-K26USB-1.28.0502.1MIPSR2Toastman-RT-N-VLAN-VPN-NOCAT tomato-K26USB-1.28.RT-N5x-MIPSR2-108-AIO-64K (Shibby) None of these builds work. After flashing and clearing NVRAM the router gets stuck in a reboot loop. The following builds seem to work: dd-wrt.v24-21676_NEWD-2_K3.x_mega_RT-N66U tomato-K26USB-1.28.RT-N5x-MIPSR2-112-AIO-64K (Shibby) RT-N66U_220.127.116.11_372.31_0 (Asuswrt-Merlin) (I initially flashed this from the web UI on the stock firmware, and haven't tried it via the recovery tool. Edit: Does not work via recovery tool. Gets stuck in reboot loop like the others.) I would like to use a Toastman 1.28.0501.3 build since it is what I have been using for a while, and is a build in which IPv6 works. Any help with this would be appreciated. I'd be ok using a Shibby build also, but as with the most recent Toastman builds IPv6 does not work with Shibby. My ISP requires VLAN tagged 1492 MTU PPPoE to authenticate and obtain an IPv4 address, and DHCP-PD for IPv6 with a /48 prefix. On the Shibby 112 build the router could obtain its v6 prefix, and it did announce it to the LAN, however the MTU on the router advertisements was incorrect, and all clients report Destination net unreachable when attempting to connect to any v6 hosts. Edit: The hardware revision of the unit is B1, and the bootloader version is 18.104.22.168. It came with firmware 22.214.171.124.274. Thanks.