I can't update the software on my Apple Watch Ultra 2

Connect the charger to a wall socket.

Place the back of your Apple Watch on the magnetic charger allowing it to click into place.

When the battery charging icon is displayed, charging is in progress.

Press and hold the Digital Crown.

Simultaneously, press and hold the Side button until your Apple Watch is restarted.

On your phone: Press Watch.

On your phone: Press My Watch.

On your phone: Press General.

On your phone: Press Software Update. If a new software version is available, it's displayed. Follow the instructions on the screen to update the Apple Watch software.