How to Fix HP Officejet Pro8620 not Connecting to WiFi?

Is there anyone who knows about how to fix HP Officejet Pro8620 not connecting to wifi. I am trying to fix it but fail. Help me.

Fix HP Officejet Pro8620 not Connecting to WiFi:

HP Officejet Pro8620 is not connecting to WiFi to fix this issue; you can follow the steps given below.

Network Restore of HP Officejet Pro8620 Printer

Step 1: Press and move your finger across the screen on the printer control panel, then touch Setup, then Network Setup.

Step 2: Touch Yes after selecting Restore Network Defaults.

Step 3: The network defaults have been restored, according to a message.

Step 4: Select OK.

Reboot the HP Officejet Pro8620 Devices

Step 1: Turn off the computer, router, and printer.

Step 2: Allow 60 seconds to pass.

Step 3: Wait for all of the lights to stabilize before turning on the Router.

Step 4: Allow the printer to configure itself after turning it on.

Step 5: Switch on your PC.

Run Wireless Wizard on HP Officejet Pro8620 Printer

Step 1: Touch and slide your finger across the screen on the printer control panel display, then touch Setup.

Step 2: Setup your network with a touch.

Step 3: Touch the Wireless Settings.

Step 4: Touch the Wireless Setup Wizard to get started.

How to Fix HP Officejet Pro8620 not Connecting to WiFi?