NEO X5mini is one of the products from Minix, it comes with Rockchip RK3066 dual core CPU. Minix just release two stock firmware for this model, you can download it here:

Android 4.1 Stock firmware, download here

Android 4.2 Stock firmware, download here

some changelog you may be interested:
1.) wifi status indicator arranged
2.) Added software AirPin (PRO)
3.) Added vox taxation services of Google
in April.) Added support for the new NEO A2 air mouse;
5.) Added anti-aliasing full screen
6.) Deleted app “Tuzi.TV”
7.) Added support init.d

Flash tools you should use is here:

http://www.mediafire.com/download/cmj5b4222p7cbm7/RKBatchTool_v1.7.rar

If you don’t know how to instal drivers, you can do the following:

Step 1- Install Moborobo [ http://www.moborobo.com/ ]

Step 2- Connect NEO X5mini with charger, and use the usb cable to connect NEO X5mini with your PC, press the power on button on NEO X5miniand power on the neo X5mini;

Step 3- Go to settings in android on the NEO X5mini and choose USB and check Connect to PC

Step 4- Go to storage (in settings in android on the NEO X5mini) then in the right corner under USB connection check mass storage

Step 5- Go to Developer options check USB Debugging

Step 6- Run Moborobo and after finding your android device connected to the computer it will promt to install the drivers…choose install driver software anyway