CCTV and HDMI nightmare!

andy1249

Unlikely to work , for the same reasons as trying to solder a new  plug onto a cable.
You also break the symmetry of the twisted pairs doing this which are also critical.
Even if you get a connection, bandwidth of the cable will be drastically reduced and it will be unstable.

cosmicma

didn't realise it's that critical but for the sake of a few minutes with a soldering iron i would be giving it a try you never know he might get lucky

Harry Hendel

To make it easier for future, run it under the carpet or in a spot easy to reach in the ceiling. I'd also buy Certified Premium HDMI cables that have outdoor certification, just to make sure it's durable.