Flashing firmware is not like installing an app. You need specific tools and a Windows PC (7/10/11). The ZTE Blade L220 typically uses one of two chipsets: or Spreadtrum (Unisoc) . Identify yours by looking at the phone’s FCC ID or opening the battery compartment.
: Standard configuration includes 2GB RAM and 32GB internal storage . Firmware ZTE Blade L220
Some firmware versions are provided as update.zip files for local installation. Flashing firmware is not like installing an app