What is the build date you have currently? You cannot just update to V4 without the correct path. You need to be on the January 2019 firmware on V3 before you can apply the first V4 version. Trust me
What is the build date you have currently? You cannot just update to V4 without the correct path. You need to be on the January 2019 firmware on V3 before you can apply the first V4 version. Trust me
Did you do the sequential updates to get it to V8? There is a path of updates needed to do such an update. If it did not work, you might need to fully factory default it in Recovery Mode. That might work but you should push Dahua for support