Hello, 
  
I have 3 different models of cameras (CONHD-A1080P(HD-820), CONHD-A3MPB4(HD-825), CONHD-and C3MPB(HD-825). 
  
I was successful and able to upgrade the the C3MPB to HIKVision firmware 5.4.5_170123. The other cameras failed with "Upgrade failed." 
  
The C3MPB was on Swann 5.2.0 and I went HIKVision 5.4.1 -> 5.4.5_170123 
  
The A3MPB4 are on Swann 5.0 and I tried flashing hikvsion 5.1.2 firmware 
  
The A1080P are on Swann 5.1.2 and I tried flashing hikvsion 5.1.2 firmware 
  
  
Is there a chance these are non hikvision cameras? I'm probably going to try opening one up and taking look.