I found two sources of firmware.
1.http: //ftp.asm.cz/Dahua/kamerove_systemy/_Firmware/04IPC/09-Wifi%20Consumer/DH/DH_IPC-Consumer-Chou-Rhea_Eng_P_V2.460.0000.3.R.20170628/
2.https: //www.ipcam-helpdesk.nl/dahua-support-documenten/camera/wifi-outdoor/ipc-hfw1235-1435.html
Unfortunately, I can...