If you cannot get the SD card method to work or need to "resurrect" a hard-bricked device, the community tool is the only way to flash the bootloader partition directly via USB.
Some users look for BLL-L21 firmware to escape the aging EMUI environment. While official support for the bll-l21 firmware
Sometimes an update fails, or your phone gets stuck on the logo. In these cases, you might need to perform a factory reset or a manual firmware flash. Factory Reset (Standard Recovery) If your phone is laggy but still boots: Go to . Tap Backup & reset > Factory data reset . If you cannot get the SD card method