Open Xperifirm and locate the Xperia L1 (G3312). Download the appropriate firmware for your region. Once downloaded, the tool will unpack the files and create the single FTF file needed for the process. Move this file to the C:/Users/YourName/.flashTool/firmwares folder. 2. Configure Flashtool
If you prefer not to use third-party tools, Sony provides official ways to repair the software and clear locks:
To remove the lock on a Sony Xperia L1 (G3312) Go to product viewer dialog for this item.