This firmware is most likely suitable for Alfawise A9 (not tested, but the firmware from Alfawise A9 works on the TR99 Mini)
File Name: S905M2_TR99_MINI_MP_20190414.img
Version: Android 8.1.0 Oreo (June 2018 security patch)
Links:
Download from MEGA
Download from Google Drive
Amlogic USB Burning Tool is recommended for flashing (confirmed to work with version 2.1.7.0). Use Google to find download link for the tool.
Flashing tutorial:
To connect your Transpeed TR99 Mini TV box to your PC, use USB A Male-to-male cable. Plug the cable in the USB port FURTHER from the SD card slot. Before plugging the cable to your PC, hold the reset button (behind the A/V jack there is a switch, use a toothpick to press it). If the device is recognized, you can start flashing in USB Burning Tool.
Root:
Download from yadi.sk
Put on SD Card or USB
Flash UPDATE-supersu-2.82.1.zip via Update&Backup app
TWRP 3.2.2:
Download from yadi.sk
Put on SD Card or USB
Flash TWRP322_AML_ViT.zip via Update&Backup app
This is a temporary TWRP, it does not replace stock recovery
For reboot TV Box go to Advanced-> Terminal. Write reboot.
TWRP 3.2.3:
Download from MEGA
Flash this img file via temporary TWRP
or
Rashr - Flash Tool app (root needed)
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