You need a "Stock ROM" or "Firmware." Use the search bar on AligsmLab to find the specific firmware for your model number (e.g., SM-A525F ).
MediaTek (MTK) processors power a vast majority of budget and mid-range smartphones globally. The SP Flash Tool (Smart Phone Flash Tool) is the industry standard for these devices. It allows users to flash scatter files, format the device, and recover dead phones. It is one of the most powerful tools because it can operate in "DA Mode," which can save a device even when the primary bootloader is corrupted. flash tools aligsmlab.com