Download Android 10 stock firmware for Sunvell T95 TV Box with Dual Band WiFi from here or here. Download firmware for single WiFi 2.4G version from here. Flash it from PC using LiveSuit v1.11 or from SD card using PhoenixCard v4.2.4.
Archive size: 773 MB
Model: Sunvell T95 TV Box dual Band Wifi (2.4G & 5G WiFi)
Platform: Allwinner H616
Image name: T95-H616-AW859A-10.1.A19.img
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. BTW, a link doesn’t last forever.