Answered: How flash a stock ROM or firmware onto the ZTE Blade L2 with Single SIM

Follow the below steps to try and flash/download the ZTE Blade L2's firmware or ROM.

1. First download and extract the: SP Flash Tool
2. Also download and extract the AG Chacer's firmware or ROM from [ROM Download]. 
3. Install the MediaTek Preloader USB VCOM drivers as per the tutorial here
4. Launch the SP Tool from the extracted folder
5. Click 'Scatter-Loading' > browse to and locate the scatter .txt file from your extracted firmware or ROM files > click Open
6. Make sure 'Preloader and UserData' are unticked (not checked).
7. With the ZTE Blade L2 turned off and disconnected, click on the Download/Start button
8. Connect the ZTE Blade L2 to the computer via a compatible USB so computer can detect and connect to its system
9. 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 Blade L2 device and power it on for a re-setup.