IPAD NOT LINKING TO ROUTER SINCE iOS 11 installed

[#1]

Can anyone advise me - my ipad has worked ok with plusnet for a few weeks but since I altered the password on plusnet and installed iOS 11 on my ipad I cannot link to plusnet every conceivable password has been used but I keep getting message password incorrect or cannot join plusnet network.  I have spoken to both Apple and Plusnet but in neither case has there been a resolution but some talk of returning to factory settings - promised an email on this from Apple but none received.  I am on plusnet re my desk top Mac which is on El Capitan and on my Samsung mobile phone so internet is arriving in my household.  I have opened MAC both almost on top of router and by my desktop but same response.  Would be grateful if someone could advise me.  Unfortunately I am told once you upgrade the iOS system you cannot go back down to iOS 10.

thanks for any advice

Howard Johnson

[#2]

The new password is working on your other devices? When you say altered the password on PlusNet, do you mean an account password, or just the Wi-Fi one?

Depending on your iPad model, I would try and do a soft reset. It doesn't wipe any data. So Google "iPad (model number) soft reset", and it'll tell you the button combination you need to hold down.

I had a similar problem with my iPhone not connecting to networks, though it didn't tell me the password was wrong just wouldn't connect for some reason and a soft reset fixed it.