Hi, Orion R28 Users,
The RK3288 is 32-bit cpu, but the Lollipop(5.1) is 64-bit system, so the system is not highly matching with cpu.
Our engineers try best to release the Beta version and will keep updating.
Here is the Lollipop(5.1) For Orion R28.
Here is the flashing tools&intructions&drivers
via@Tronsmart Team. http://www.tronsmart.com/