There are some validations but nobody knows what exactly validations are done. One thing is certain, the upgrading checks a region flag to validate if the product (camera, NVR) is destined for the same region as the firmware. They check for example if the camera is destined for china or for the western world. Check the work of region change from the CBX member.
With respect to the de-bricking process. I would say that whatever you have to do to learn, do it during the warranty period before you commision permanently the system into operation. In this way you will minimise future mishaps due to your lack of knowledge. Do not expect any dealer to help you learn. Their moto is "if it works, do not touch it", they do not bother to get into trouble and spend anytime.