I had the same issue with my android phone v. 4. 1. 1 and the problem was I've deleted some system apps one of them was the Go Launcher which made the phone go through a black screen or stuck at it's logo after booting, to solve that here's what I did. NOTICE 1. If you can ring to your phone and that opens a black screen but with the upper slide visible which you can open the wifi then ring to your phone and once you have that screen jump to step number 8. NOTICE 2. If your (usb debugging mode) is activated then jump to step 13. or else please keep reading. 1- start your phone from the power button. 2- leave it open on that black screen or logo (whatever you have) till the battery goes so low and the phone will be doing one of these things A) open with the warning msg but notice that the screen could be all black but you will get the upper slide screen option visible means you can slide it down or up . and that's all you need to see for now so make sure you see it, B) or will shut itself . 3- If the phone...