iphone is disabled

Hi,

My boss forgot the passcode on iphone 5s, but he don't mind to reset the iphone, so I assisted him to reset the iphone as below link instructions - "erase your device with recovery mode",

https://support.apple.com/en-us/HT204306

when I hold down the "home" button and connect the cable, iTunes prompt following screen, then I follow the steps and click "update" button

but after around 10 minutes, it prompt below message:

iTunes could not connect to the iPhone because it is locked with a passcode............., any suggestion how to solve below problem, many thanks.