Download here if you want to try the BETA upgrade: Tanix TX28 Firmware
Kind of file: .ZIP
Procedure: Copy the .zip firmare on a USB memory or TF card. Conect it to the Tanix TX28. Open Update&Recovery.app (already installed). Select the .zip and press update.
Changelog:
Amlogic S905L Quad Core 2Ghz
1GB (16-bits) RAM - 8GB eMMC Storage
Real 1080p UI + 4K@60fps video output