CSA91 official firmware is now available for download. This android TV comes with Rockchip RK3368 quad core chipset which is also being used in myriad android television sets. So flashing instructions for this android TV box is similar to ones with same chipset. So you can safely follow instructions for CR18 android television. Just make sure you use the firmware from below link instead of the one mentioned in the guide above.
You can download the firmware from here. Valid only for model with RTL8723 Wi-Fi chip.
CSA 91 specifications include RK3368 processor, 2GB of RAM,16GB of eMMC flash storage, Bluetooth 4.0, wifi with two external antennas and a small numeric display on the front to show some of its features. It runs android 5.1.1 operating system. It currently retails for 82 euros / 88 dollars including free shipping.
Remote Control: Included
Brand Name: GF
Model Number: CSA91 Smart TV Box Android 5.1
Chipset: RK3368 Cortex-A53 Octacore 64-bit CPU
GPU: supports OpenGL ES3.1, OpenCL 1.2 and DirectX 9.3
FLASH: 16GB Nand Flash
SDRAM: DDR3 2GB
OS: Android 5.1 LOLLIPOP, Octa core 64-bit CPU