Hi everybody. I have just bougth used Alcatel idol 4s windows 10 phone and noticed that it is a bit slow sometimes (shows some laggs). So I wanted to flash my phone withopen market ffu file using Microsoft WDTR. But no success! I always get error message. What should I do? Should I use T-mobile ffu variant? And if I can use it, is it possible to lock my phone since I am not from US. If not, do I lose some features from Windows 10 mobile OS?