my Apple Watch 3 does no want to pair or up date

Hi Cosio79,

Welcome to Apple Support Communities. We understand that you're having an issue with pairing your Apple Watch to your iPhone. We'd like to help.

Which iPhone are you using? Are you running the most current iOS available for that device? If your not sure, follow these steps to confirm:

1. Go to Settings
2. Choose General
3. Choose Software Update.

If you see an update available, we do recommend that you update after you create a backup. You can do that wirelessly through iCloud, while connected to a Mac, or connected to a PC. Below you're find the steps for connecting to iCloud. If you need steps for connected to a Mac or a PC, let us know which type of computer you have and we'll share those steps as well:

How to back up your iPhone or iPad with iCloud

If you back up your iPhone or iPad, you'll have a copy of your information to use in case your device is ever replaced, lost, or damaged.

1. Connect your device to a Wi-Fi network.

2. Go to Settings > [your name], and tap iCloud.

3. Tap iCloud Backup.

4. Tap Back Up Now. Stay connected to your Wi-Fi network until the process ends. Under Back Up Now, you'll see the date and time of your last backup. If you get an alert that you don't have enough iCloud storage space to complete the backup, follow the onscreen steps to upgrade your iCloud storage.

How to back up your iPhone or iPad with iCloud - Apple Support

Finally, please let us know if you've had this Apple Watch paired with this device in the past. This will help us determine if these devices are compatible with each other.

Let us know when you can.

Cheers!