Download Android Nougat 7.1.2 firmware for Qintaix R33 TV Dongle from here, here or here. Download Rockchip Driver Assistant v4.4 from here and download Rockchip Batch Tool v1.8 from here. Here you can read about the unboxing of Qintaix R33 TV Dongle.
Archive size: 674 MB
Platform: Rockchip RK3328 / RK322H
Image name: update_7.1.2_rk3328_QINTAIX_R33_ap6255_20180523.img
FW version: 7.1.00
Boot version: 2.43
Model number: R33
Build number: R33 RK3328_ANDROID7.1.2-20180523
SDK version: RK30_ANDROID7.1.2-SDK-v1.00.00
Caution: Please do not update firmware unless you know what you are doing, you really want it or it is absolutely necessary. Firmware updates may occasionally have bad results, like bricking your device, temporarily or permanently. The firmware update process is done entirely at your own risk. Before attempting to update the firmware, back up your data.