Hi Andy Purchased a few HDW 5831R-ZE and a 5231 from you. They work perfectly. I downloaded what I thought was a newer version of Dahua Config Tool. Seems it was the same one and all it did was knock out my passwords. I still have cameras up and running just cannot acess them through Config Tool. Do you know of a way to reset the passwords?I can try reset button,just dont know if that is an option. have 3 cameras to a generic 8P switch to router to Synology 718 + . If it is not a simple answer I`ll try the forum but they tend to get technical . Regards Thomas