Finding the correct "download" depends on your specific hardware manufacturer. Installing incorrect firmware can permanently "brick" your device.
There is no widely recognized format called MP5. In almost all cases, .mp5 is one of the following: alps-mp-o1.mp5 download
The 4PDA Forum (Russian) is the most comprehensive source for MT8227L firmware, scatter files, and pre-loaders. Finding the correct "download" depends on your specific