[iMore Question]

When I turned my phone back on after update it is requiring a passcode which I have never used one in the past,

[Ledsteplin]

Welcome to iMore! What passcode do you use to open your phone? Maybe it's the same as that. It's either a 4 digit or 6 digit number.

[Just_Me_D]

After an update, iOS will typically prompt you for your lock screen passcode, if one was set before the update, and the passcode associated with your iCloud account. They do this to prevent thieves from attempting to take ownership of a device after restoring it.