Modifying firmware almost always voids the manufacturer’s warranty. ZTE support will refuse service on devices with flashed unofficial firmware.
Boot into recovery (usually Vol Up + Power) and perform a factory reset. firmware zte blade a52 patched
Extract the patched firmware folder. Look for key files: scatter.txt (the partition map), boot_patched.img , system.img , vendor.img , and userdata.img . and userdata.img .