I asked the device is returned to the stock rom so that I can upgrade by my self.
Fact, the seller just this unroot devices.
Now, I can't install a custom rom ...
When I try to install new custom rom, my dev get 7 vibrate and then blank screen.
I try to root by Kingo, easy ace root, windroid and FAIL! : ( Device restart and get 7 vibrate again!
BUT when I try to force out the battery and I try to turn it on again it back again, data etc.
I try to wipe the system in CWM also unsuccessfully.
This may be a very frequently asked question, I got confused with the answer that much people say 'cause the give many option
Thank for advice
My device S-OFF and now stuck at JellyTime 4.2.2.