Question juridique clé
Whether the appeal could be entered into despite non-payment of the court cost advance within the non-extendable deadline.
Solution extraite
No. Because the cost advance was not paid in time, the appeal could not be considered under Art. 108 BGG.
Motifs extraits
The appellant received notice of the advance-payment deadline and a non-extendable grace period. His explanations for the delay did not excuse non-payment; it was his responsibility to organize payment accordingly.