But what does it mean when you see a request for an "MT6833 Android Scatter TXT Exclusive"? Is there a secret club you need to join to get your phone working again?
adb shell su cat /proc/dumchar_info
Open the checksum.ini file in your firmware folder and ensure it matches the scatter's definitions, or disable "Check HW Storage" in the Flash Tool settings. mt6833 android scattertxt exclusive