Kernrechtsfrage
Whether the complaint sufficiently addressed the only issue open on appeal, namely the unasserted ground for restoration of the deadline.
Extrahierter Entscheid
The complaint did not engage with the relevant restoration-ground question and instead argued the merits, so it could not be reviewed.
Extrahierte Begründung
Under Art. 42(2) and Art. 106(2) BGG, the appellant had to specifically challenge the reason given for the non-entry decision; since he failed to do so, the complaint was inadmissible and no merits review was possible.