It is equal or identical to the Navitel E700/MS700.
Hardware info:
[Only registered and activated users can see links. ]
Compatible firmware info:
[Only registered and activated users can see links. ]

If you want to search on your own, you should search for firmware meditek MStar 2531 Cortex A7, for instance:
Spoiler: Firmwares
[Only registered and activated users can see links. ]