The safest way is to download the full stock ROM for your exact model (e.g., Realme C15, Infinix Note 8, OPPO A53, Ulefone Armor 7). Once downloaded, extract the ZIP or RAR. The MT6768_Android_scatter.txt file is inside.
Before modding, you can use the scatter file to "Readback" and create a full image of your phone's current state. How to Use the MT6768 Scatter File with SP Flash Tool mt6768 scatter file new