Unable to reset and connect

Lamp worked offline just fine after unpacking. I wanted to use app, in order to pair i’ve connected to lamp Wifi (it was on list, no password). Few steps later, I was asked to reset it - it went just fine, pulsed 5 times. After that i cant see lamp on list or reset it (nothing happens on reset button, no matter how long pressing it). Knob works fine, any offline functions also. Please help.