When you bricked your device or stuck at boot (Boot loop) the best way to fix it is flashing the stock ROM / Firmware on your device and to do that you need the firmware, driver and flash tool.
Please note that you must flash your device at your own risk. flasing may void your devices warranty. If you are a beginner then I suggest taking help of some expert or experienced user before you start flashing.
Download Firmware Rockchip Processor RK3026 Board ID C86/131113/V02 from here
Download Fockbatch tools from here