Hi ,same problem ,zs630kl , worked fine for about 16 hours, after that camera stopped working with message "cant connect to camera,another app is using camera,close it first" , then i rebooted phone and it never started again :angry: . Even recovery menu not working, bootloop as normal boot. Impossible to charge, it starts to charging, but soon boots and reboots again and again. If connected to pc, its visible only to fastboot,when first recovery menu is displayed "csc fastboot". Maybe there is a way to reflash it via fastboot tool ? Or qualcomm flash tools ? Solution needed please !