Hi lazu, These to case normally indicates a corrupt firmware yes. To have the firmware or flash file thereof, you will need to do the following. This is for the ZTE Grand X2 Premium pack offered by ZTE or carrier branded by Cellc.
- First download and install/extract the following: SP Flash Tool
- Also download and extract the ZTE Grand X2 's firmware or ROM from [ROM Download].
- Install the MediaTek Preloader USB VCOM drivers as per the tutorial here
- Launch the SP Tool from the extracted folder
- Click on the Download tab
- Click 'Scatter-Loading' > browse to and locate the scatter file from your extracted firmware files
- Make sure 'Preloader.bin' is unticked (not checked).
- With the ZTE Grand X2 turned off and disconnected, click on the Download/Start button
- And then connect the ZTE Grand X2 to the computer via a compatible USB so computer can detect and connect to its system
- The flashing process should then start with progress bars and you should get a green cycle with a white tick and the text 'Download OK' when the flashing is completed. At which stage you can safely disconnect the your ZTE Grand X2 device and power it on for a re-setup.