Thanks everyone
I found it, for now it seems to work ok
this is the link from which I downloaded the documents
the basic bin file should be inserted first, followed by the ptz file
link
http://ftp.asm.cz/Dahua/kamerove_systemy/Firmware/2017_a_starsi/05SD/01-Network%20Speed%20Dome/03-Lite%20Series/