Question juridique clé
Whether the appeal is admissible despite non-payment of the court-ordered advance on costs
Solution extraite
The appeal is manifestly inadmissible because the advance on costs was not paid within the extended deadline.
Motifs extraits
Under Art. 62(3) BGG, failure to pay the advance even within the supplementary deadline leads to non-entry; the late legal-aid request could not cure the default.