If you installed a malicious APK that wrote to the system partition, or if you manually deleted /system/app files without proper knowledge, a factory reset won’t help. Raw firmware rewrites the entire system partition, erasing all modifications.
When dealing with severe software malfunctions on Android, standard recovery menus may fail. That is where RAW firmware comes in. asus zenfone 5z -zs620kl raw firmware-
Assuming you're looking for a useful feature to write about in the context of raw firmware or custom development, I'll provide you with a feature idea: The Complete Guide to Asus ZenFone 5Z (ZS620KL)