I couldn't find anymore reporting success or failure on a v1 in this thread. so...
Just updated from DH_NVR5XXX-4KS2_MultiLang_V4.001.0000003.1.R.200813 to DH_NVR5XXX-4KS2_MultiLang_V4.001.0000006.0.R.210208 successfully..
Mine is an older DHI-NVR5232-4KS2 - The original firmware when I purchased this was V3.216 (2018).
Just updated from DH_NVR5XXX-4KS2_MultiLang_V4.001.0000003.1.R.200813 to DH_NVR5XXX-4KS2_MultiLang_V4.001.0000006.0.R.210208 successfully..
Mine is an older DHI-NVR5232-4KS2 - The original firmware when I purchased this was V3.216 (2018).