You are right, I was wrong to read the Start Time
my serial number : DS-7204HVI-SV/A0420150530AAWR520797635WCVU
start time : 2018-09-02 16:19:58
software version V3.1.4build 150430
DSP version: V5.0 build 150324
SADP 2.1.0.2 (with newer versions I can't insert Serial code but only the xml file)
Serial code obtained with the app: RRSzr9SeSr
but fail ever