Can't connect to DIY Mode Sonoff

Hi! I have a Sonoff Pow Origin device. I want to use it in the DIY Mode for HTTP controlling. I have updated the firmware in the app, powered up the device, pressed for 5 sec the button, then the ITEAD network appeared, connected to it without password(hasnt requested), and then searched url and it wasnt found it. Should i do something else? I read somewhere that i have to do something with the GPIO pins.