DS-2CD1621FWD-IZ V5.4.81 password recovery

[twojastara]

Hi!
I have 4 cameras DS-2CD1621FWD-IZ V5.4.81 with software 5.4.81 build 180203
I try everythink - with hikvision support too - but xml from support doesn't work (error 2022)...

How can i restart password in this cameras?

 

[alastairstevenson]

Are these cameras connected to an NVR?
If so - have you tried the NVR password?

 

[twojastara]

Are these cameras connected to an NVR?
If so - have you tried the NVR password?

Yes, they were connected to the NVR before I got it - but the NVR password is not working: C.