My Apple Watch 3 42 mm gps

Hi Mohammadashad,

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

Is your Apple Watch currently connected to your iPhone successfully? Does your iPhone have a good cellular or Wi-Fi connection? The Apple Watch will use the network that the device is using to get the update verified so this could be an issue if you're having issues with the connection on your iPhone.

Then, you'll want to do the following and test if the issue persists after each step:

1. Restart your watch - Restart your Apple Watch - Apple Support
2. Remove media and apps like music or photos that are synced to your watch.You can also remove some apps to free up space and try to update again.

3 . Unpair and update your Apple Watch

* Keep your Apple Watch and iPhone close together as you unpair them.

* Open the Watch app on your iPhone.

* Go to the My Watch tab, then tap All Watches at the top of the screen. 

* Tap the info button  next to the watch that you want to unpair. 

* Tap Unpair Apple Watch.

* For GPS + Cellular models, choose to keep your cellular plan. 

* Tap again to confirm. You might need to enter your Apple ID password to disable Activation Lock. Before erasing all content and settings on your Apple Watch, your iPhone creates a new backup of your Apple Watch.

You can use the backup to restore a new Apple Watch.

Next, set up your Apple Watch with your iPhone. When asked whether you want to set up as new or restore from a backup, choose to set up as new. Then follow the onscreen instructions to finish setup. If you want to update to the watchOS beta, reinstall the beta profile after setup is complete.

Finally, update your Apple Watch.

Hope that helps.

Take care!