Cant connect appple watch series 3 GPS to Iphone 6
I recently got an apple watch series 3 GPS with watchOS 6 on it, I know that watchOS 6 needs ios 13 or later but I factory receted it to watchOS 4-5 and on the apple watch box it says that it needs an iphone 5s or later with ios 11 or later and my iphone 6 has ios 12.5, so when i try to connect my apple watch to my iphone 6 it says update iphone or continue without update, whenever i press both it says unpairing apple watch and i just cant get them working together, Please help if you know how :)
And does that mean Apple is forcing us to buy better devices ?
iPhone 6, iOS 12