Hello,
I am trying to update the firmware on all 4 of my DS-2CD2042WD-I 4MM UK Spec cameras but they come up with upgrading failed. All 4 are currently V5.3.6 build 151105. I have tried the new v5.4.0 from here and even the v5.3.8 first in case it had to go on before the v5.4.0. Any idea's...