@Clive_A can't downgrade to previous firmware " unable to load the file. Make sure the firmware file is correct and the network is connected, then try again." yes I have downloaded the correct...

@Clive_A yes I am using the original power adapter and power supply is stable. 1 used drive and 3 brand new drives from different brands I have tried but still same issue. the same 4 hard drives I...

Hardware version is 1.2 it did not allow me to select 1.2

Every time the nvr reboots due to power failure or manual reboot from the reboot option from the screen, the hard disk needs to be reformatted as it shows a pop up with beeping noise saying "...