Apple Watch series 3 - plz help?

I have a Apple Watch 3 and iPhone 11. I hasn’t used my Apple Watch forever but decided to try it today when debating on buying new

One. So I paired them after I reset. The watch to factory settings. Then it said software update required. Took like three hours abs then when said complete like not even paired. The watch said update complete but the phone was still asking to pair them ? Any insight on this would be greatly appreciated 

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