If you have a working L270 in hand, consider making a backup first using a tool like Miracle Box or CM2. This creates your own "unlocked" flash file that is guaranteed to work on that specific hardware revision.
The Symphony L270 flash file, typically containing a MediaTek MT6261 chipset, can be found on reputable, non-password-protected sites like FirmwareFile or RepairMyMobile, which offer .bin or scatter files. Successful flashing requires installing MTK USB VCOM drivers, using a flashing tool like SP Flash Tool, and connecting the phone while holding the boot key to prevent hard-bricking. You can find the firmware at FirmwareFile.
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For a step-by-step demonstration on how to locate and use these flash files for Symphony devices:
If you own the device and need to flash it legitimately: