It's Chinese branded.
Model nr: DS-2CD2135F-IS
Serial nr: DS-2CD2135F-IS20151223AACH564903891
I have used EN firmwares from here (and changed their language flag to CH with Hikvision Firmware tools):
DOWNLOAD EU PORTAL
Also I have used CH firmwares from here:
海康威视是以视频为核心的物联网解决方案提供商
I'm...