I've meant that, now they're back on H265 and it's ok. But the issue was only with 8MP cams, 4MP and 3MP was ok.
Oh, and i was switching the substream only!
Here you can find even newer SW (Russian Hik-FTP):
ftp://ftp.hikvision.ru/01.%20%D0%A0%D0%B5%D0%B3%D0%B8%D1%81%D1%82%D1%80%D0%B0%D1%82%D0%BE%D1%80%D1%8B/02.%20DS-76XX%2077XX%2086%D0%A5%D0%A5%20NI-K/DS-7XXXNI-K2%20K4%208XXX-K8/
European download portal is somehow slow with updates.