2335 Firmware 5.4.23 down to 5.3.6?

OICU2

BIT Beta Team
Jan 12, 2016
920
1,658
USofA
I recently purchased some 2335's that have firmware 5.4.23 and cannot be upgraded. They seem to keep rebooting every so many minutes and I lose signal in BlueIris. One of the 2335's I purchased separately has version 5.3.6 and that one doesn't seem to have an issue. Is it possible to go backwards without bricking it?
 
I recently purchased some 2335's that have firmware 5.4.23 and cannot be upgraded. They seem to keep rebooting every so many minutes and I lose signal in BlueIris.
Are you allowing inbound access from the internet - ie 'port forwarding', or maybe have UPnP enabled on your router and also the cameras?
If so - this could be the Hikvision hacking that's been going on for a while now on a large scale, using the Hikvision backdoor high-severity exploit.
 
No, the network they are on is private does not have a physical link to the internet, it is standalone.