Cannot connect

Hello. Today i got the lamp with wifi. First time I somehow connected trough Mihome app on iPhone. It Asked wifi password and done . working - remote color, on/of it also asked for FW update. But then I changed router and I cant make it work again. Holding power button or unplug, holding button and plug as reset won’t work. Changing region to USA / china " HK doesn’t help. It ask for wifi password and then it go to No bluetooth devices found. If i turn off bluetooth i get to message that says “set your iPhone wifi to yeelink-light-xxx”. In wifi list i can’t see that wifi. So. What can i do now? how to hard-reset or make it work again? Thanks…

Edit: tried on brother’s android phone and can’t make it work aswell…

To reset the lamp you need to press and hold both buttons not only power. Keep them pressed and the light will flow for a couple of seconds then flash and finally turn on with white colour. It takes more or less five seconds.