WNR3500L v2 - AdvancedTomato 3.4-138 K26 USB AIO - Gigabit not recognized

Hi,
I've just installed AdvancedTomato with this firmware : Tomato Firmware 1.28.0000 MIPSR2-3.4-138 K26 USB AIO on my Netgear WNR3500L v2 and it doesn't recognized it as a gigabit router. (Speed is capped at 100 Mbit)



Is it a known limitation of Tomato (and then I'll have to go back to the netgear firmware) or did I miss something in the configuration ?

Thanks