Download Android 8.1 stock firmware for R-TV Box S10 Plus from here, here or here. Download Rockchip Driver Assistant v4.5 from here and download Rockchip Batch Tool v1.8 from here. Download Android 7.1 stock firmware for R-TV BOX S10 from here.
Archive: R-TV BOX S10 Plus 20180526
Model: R-TV BOX S10 Plus
Image file size: 797 MB
Platform: Rockchip RK3328 / RK322H
Image: R-TV BOX S10 Plus 20180526.img
FW version: 8.0.00
Boot version: 2.46
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.