If you need new passcodes, there are three ways you can request them.
On your phone, go to Duo Mobile. Tap the entry that says "CalNet - UC Berkeley" to generate a passcode. This works anywhere, even in places where you don't have a WiFi connection or can't get cell service.
You can click Text me new codes at the bottom of the second-step verification login screen.
Then, check your cell phone for a text message with 10 passcodes. You can enter any of these codes for the second-step verification.
You can also request passcodes by logging in to the CalNet Account Manager and selecting Get Backup Passcodes at the bottom of the Device Control Panel screen.
Get a Passcode from a Simple Hardware Token
Press the red power symbol on your simple hardware token. A numerical code will appear on the token’s screen.
Note: Passcodes are single-use only; you must enter a new passcode each time you verify.