First download Rockchip driver USB fix archive from here, here or here. The archive contains two system files: usbhub.sys & usbport.sys (x64 & x86 versions).
Go to your system folder C:\Windows\System32\drivers and back-up these 2 files (usbhub.sys & usbport.sys). Then run as admin the file 'franken-usb.bat' or copy over yourself the provided 2 files from the archive over the original existing ones in C:\Windows\System32\drivers.
Restart your PC. Install RockUSB driver with Rockchip Driver Assistant. Run Rockchip Batch Tool v1.7 and if the first block is pink then press 'Switch' button to turn it into green. The press 'Restore' button to flash the new firmware on your Rockchip CPU device (in my case a RK3188 tablet).
See the below video for details.
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