i have china 4s, the problem is showing DEMO SOFTWARE, after format the phone working 1 day fine, after 1 day its show DEMO SOFTWARE when power on the phone, then i got same flash file from another same phone, wright flash ok but after 1 day its show again DEMO SOFTWARE.... pls help me i already post about this issue... wright 4 types of flash files to this phone, but still same problem......
http://forum.gsmhosting.com/vbb/f720...wered-1546739/