My Apple Watch series 6 want update from my iPhone 12
My Apple Watch series 6 want take the newest update and I have iPhone 12
Windows, Windows 10
You should be able to update a series 6 watch to watchOS 10. What iOS version is on your iPhone 12? You should be able to update that to iOS 17. See the 'Need more help with updating?' section in:
Update your Apple Watch - Apple Support