Samsung Galaxy S3 not booting up, just shows ”Samsung Galaxy S3 GT-19300” black screen This morning I woke up to my Samsung Galaxy S3 which just “hung” during the start-up screen with the white text “Samsung Galaxy S3 GT-19300” on a black background. It never comes to the “Enter Pincode” screen.

It worked without a problem when I went to sleep last night. As far as I know it should not update the software on its own, similarly the apps shouldn't update themselves without my confirmation.

I have tried to restart it and to take the battery out and put it in again but the result is the same.

Any suggestion or advice on how to fix this would be so much appreciated.
Your system might have become corrupted or hampered by some misuse/mishap.
The method below will install Latest factory Firmware for your Samsung device, i.e., Unbrick the phone.
Steps to Install latest firmware
Note: Write your phone's model number like &quot;GT-I9812&quot; and IMEI number on paper beforehand.

Put your device in Download Mode.

Don't connect your device to USB port


Now, on PC, download and install Samsung KIES.

Now, after installation, reboot PC. All required drivers will be installed for the PC and android device.

Connect your device to the PC


Open Samsung KIES, Go to Tools &gt; Firmware Upgrade and Installation.

Dialog will popup asking for Model Number. Put Phone's Model Number which you have written on the paper and Press Next.

Now, it will ask for the IMEI number of the mobile phone. Just put that in and Press Next.

There will be some dialog boxes about the system reset and warnings. Just Click Ok/Next.

Now,Samsung KIES will download system software for the device and Install it on the device itself.

This will take lot of time, so be patient.(Time depends on the Your Network Speed.)



Voila! Your Phone is New Again. (atleast on the inside. :-P)