That´s where i get the downgrader from. I´ve used this, i´ve used the 5.2.5... Always the same. No "System update compleded".Have you tried this: https://www.ipcamtalk.com/showthread.php/4036-Custom-Firmware-Downgrader-5-3-0-Chinese-to-5-2-5-English
First sticky on this sub-forum.
Check if it's 4.0.8 or is the same as that you flashed it with.In particular the firmware version showing