Hikvision Webif Audio Mic in is missing, only Line in

[schlier]

Hello

i have several China Hikvision Cams, see down
In the newer Firmware there the is the option Mic in missing under Audio input

DS-2CD2135F-IWS V5.4.20 build 160726. Mic in is missing
DS-2CD2132F-IS. V5.2.5 build 141201 Mic in is there
DS-2CD3145F-IS. V5.3.6 build 151221. Mic in is missing
DS-2CD2142FWD-IWS V5.5.5 build 180111 Mic in is there

Please help me