Ultraloq Smart Locks don't support the master key function.
If you want to rekey the cylinder or duplicate your keys for the U-Bolt series, please share this FAQ Description of the Ultraloq U-Bolt Series Cylinder Lock with the locksmith.
Ultraloq U-Bolt Series uses the Schlage shape C Keyway and Keys, and it's pretty simple to replace it yourself. You can follow this video to change the cylinder for Ultraloq U-Bolt Series.
FAQ
> Can I use my existing deadbolt cylinder with my existing keys? The lease does not allow us to change keys.
No. We don't recommend using a third-party cylinder.