SB5100 cant access GUI

I couldn't access to GUI (192.168.100.1 or 192.168.100.1:1337/666)" page not found " i try with sigma x n SB5100MoD firmware
I could get in to 192.168.100.1 if i flash it with firmware:
SB5100-2.3.9.0-GA-00-NOSH-NNDMN
I have try different boot loader as well but no luck
PLEASE HELP