If you're looking for a specific piece of firmware or more detailed instructions, providing more details about your device (like the brand and model) could help in getting more precise guidance.
For the MT6572, such firmware typically includes: mt6572 universal firmware work
Light ROMs like WEAKED OS (KitKat-based) are reported to improve performance on these aging dual-core chips by adding game boosters and removing bloatware. If you're looking for a specific piece of
Display compatibility is the most visible hurdle. mt6572 universal firmware work