According to the new sadp user manual, suppose to generate a key then send to them for a file to import back...this seems to be happening to 5.3.x cameras as my 5.2.0 camera were still accepting security code reset.
When you export, it generates a file called DeviceKey.XML and when you open it with a notepad it'll give you some letters...(i got 'AwAAADQ2NzQ1MDc0N/G6ICg=') when i tried to open it.
I tried to use the password reset code to generate a code, save it onto a notepad file, renamed it as an xml file, then import...but no good.
Luckily my cube camera had a reset button so it went back to the default setting after i turn off the camera, held the button down with a pencil and power it back on, hold it down for 10 seconds and let go of the button and it went back to the default settings.
Only two ways to do it seems like without hoping for help from Hikvision...either
TFTP flash the firmware again or find the hard reset button on the camera (hope you have one!).
PS: thank you bp2008 this tool has saved my butt countless times as it has many others!