thanks for your advice and solution but it's not working (my phone is still disconnecting and connectking no matter what I do)
Originally Posted by rdannar
you are you are so close. hold volume up and power during thé connect disconnect cycle and it Will connect
Sent from my SAMSUNG-SGH-I777 using xda premium
I tried it, phone is still disconnecting when I hold volume up and power or when I hold any other combination of keys.
When I connect the phone (with battery) and press only power I hear sound of connecting device in windows and then immediately disconnecting sound.
So it looks like the phone wants to start but something is damaged, blocking (I think it's hardware problem). Also in the past it hanged many many times (but I was able to restart until the last one).
Right now phone is on the way to service.
Thanks everyone for help.
I will inform about results of repairing by service.