Download Android Pie 9.0 new stock firmware for HK1 Mini+ TV Box HS2734C version from here or here. For SP6334Q version download the firmware from here. Download Rockchip Driver Assistant v4.7 from here and download Rockchip Batch Tool v1.8 from here.
Archive size: 1.0GB
Model: HK1 Mini+ TV Box HS2734C version
Platform: Rockchip RK3318 / RK322H
Image name: RK3318_DC_HK1_MINI+_HS2734C_9_20190622.0023.img
FW version: 9.0.00
Boot version: 2.49
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.