Sir, while we are updating the iOS 15.6.1 version and get to my work , if I again return to see the update , it’s showing that your WiFi and phone are disconnected ,l tried several times but it is vain

Hello deetya135,

Thank you for reaching out in Apple Support Communities. It sounds like you're unable to complete the iOS update due to a disconnection from the Wi-Fi network to your iPhone. We can help point you in the right direction.

First, please see if the steps in this Apple resource help your situation: If your iPhone, iPad, or iPod touch won't connect to a Wi-Fi network - Apple Support

Next, we recommend you to forget the Wi-Fi network on your iPhone, and reconnect it. From there, let's see if you can complete the update. To perform this step, please go to Settings > Wi-Fi > tap on "i" > Forget This Network.

Then reconnect the iPhone to the same Wi-Fi network and see if you can complete the update.

If that doesn't help, please use another Wi-Fi network for the update.

Following these steps can help.

Best regards.