Below is the general method for a using SP Flash Tool (the most common L220 variant).
Flashing new firmware (the phone's operating system) is a more advanced process than a simple over-the-air (OTA) update. Users typically consider it for several reasons: Firmware ZTE Blade L220
If the phone refuses to boot past the logo after a successful flash, boot the phone into Recovery Mode (Hold Volume Up + Power button while off) and select Wipe Data / Factory Reset , followed by Wipe Cache Partition . Below is the general method for a using
Monitor the progress bar until a popup window featuring a materializes on screen. Safely disconnect the USB cable from the device. Firmware ZTE Blade L220