ipad help

I have an iPad 4th generation model no A1460

As it is nearly 5 years old and slow I deleted apps and photo’s.  Then couldn’t reload anything or do the software update

Then decided to clear it all and go to factory settings

BUT

The email account used to set the iPad up no longer exists –

when I got an iPhone and set it up I used a new email and have never been able

to use the cloud since, they just get confused!

It now says to ‘use the Apple ID and password that were used

to set up this iPad’ but I don’t have a clue on either.  If I use the one for my phone it says the

email address cant be used to unloke this iPad.

Anyone any the wiser?