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Yeah they got back to me saying the my serial number check confirms an international or unapproved sale such as overseas, so they can't provide me with support.

The only similar looking unit I could find is X51C1E Series on the US website you provided but it can't be that as that unit is a dvr. I tried searching for schematics online but couldn't find anything as I doubt it's something that dahua would want floating around the Internet. I would try and...

So even if I purchased a usb-ttl how would I go about flashing a new firmware onto the nvr?

Unfortunately ringing is out of the picture but i did email them you cant ring the uk departament of dahua unless you are a registered business.

Thanks for the reply. ive already emailed support still waiting for a reply and yes im okay with opening the unit up the only problem is i probably lack the cable

i was updating my firmware for my nvr and the router went offline for some time killing the update process after which it completly bricked the nvr which is now stuck and boot up screen I'm not sure if this is fixable and don't have the knowledge on how to fix this so i created an account here...