Kernrechtsfrage
Whether the civil appeal is inadmissible because the advance of costs was not paid within the second deadline.
Extrahierter Entscheid
Yes. Because the advance was still unpaid after the additional non-extendable deadline, the appeal had to be declared inadmissible.
Extrahierte Begründung
Under Art. 62(3) BGG, if the advance is not paid within the initial deadline, a further deadline must be set; failure to pay within that second deadline makes the appeal inadmissible. That condition was met here.