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Hi All, I purchased a UK Dahua NVR in 2020 and have tried to update to the latest firmware (DH_NVR4XXX-4KS2_MultiLang_V4.001.0000005.1.R.201126 according to the Dahua website) and halfway through "upgrading" it flashes up a quick messgae in red text stating the upgrade failed and then restarts...