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I didn't downgrade. I have to live with these bugs/errors and wait for new released firmware. You can use 3rd party software to downgrade. But it's high-risk to brick your NVR.

Change IPC's name in NVR always error in every firmware version, sometimes it automatically change to weird name or change back to default. It will never work, though I don't think it bother that much. I suggest you should stop downgrading because it may brick your NVR.

Thank you!

I have found a firmware called DH_NVR5XXX-4KS2_MultiLang_V4.002.0000000.3.R.220322.bin Date: 2022-04-25 You may google and download it. I haven't tried yet.

I don't remember. It's also risky to downgrade, cause bricked NVR.

I just did and it not show up too.

Hello, I have Dahua NVR58164-4KS2 After update to newest firmware download from official dahuasecurity page (DH_NVR5XXX-4KS2_MultiLang_V4.002.0000000.5.R.220729), I can not add camera by using Custom protocol (RSTP) anymore. It doesn't show up in droplist. The previous firmware is still support...