Cannot get Shelly 1 to connect

I have tried all the methods I can find to connect my Shelly 1, have even bought another in case the first was faulty.

I am trying to access through my and everything works upto connecting Shelly and then it says that the access to my router (Billion-8800 NL) is denied because the password is wrong. It is not. I have double checked so many times.

I have tried to use and access point but although I can get into the Shelly settings it says the passwork is wrong. Have tried resetting it by switching it off 5 times but that does not seem to make any difference.

I have been trying this for over a week now and am very frustrated. Can someone please point me in the write direction

I have just tried another new one and that has also failed so will be returning all for a refund.

Thank you but have had to return them as on 2 the wifi failed soon after turning them on.

A pity as they were the ideal solution for me.

I have bought another Shelly 1 from you in hope of better success but still cannot get it to connect. Other devices connect without problem.

I go through the procedure as laid out in your directions and all goes well untill it says cannot connect to 192.168.33.1. I have changed the IP to 192.168.1.15 and is confirmed when I connect to the Shelly and go to settings but somehow this address is not being registered correctly. Can you help please.