Reinstall the official Android OS (Stock ROM).
Check XDA’s MediaTek general discussion thread. Typically, the MD5 is d41d8cd98f00b204e9800998ecf8427e (example only – always verify live hashes). sp flash tool 5.2032
: Check and verify external RAM and NAND flash. Reinstall the official Android OS (Stock ROM)
: Flashing stock ROMs to restore a device to factory settings or installing custom ROMs for a modified user experience. sp flash tool 5.2032