Download Marshmallow 6.0 stock firmware PC version for Tanix TX8 TV Box from here or here. Download Marshmallow 6.0 stock firmware SD card version for Tanix TX8 TV Box from here or here. Download previous firmware from here. Download Amlogic USB Burning Tool v2.0.8 from here or download Amlogic Burn_Card_Maker v2.0.2 from here.
Archive: TX8-6255-20170105 / TX8-6255卡刷
Model: Tanix TX8 TV Box with 6255 WiFi module
Image file size: 542 MB / 608 MB
Platform: Amlogic S912
Inside archive: firmware + factory_update_param.aml + recovery.img
Image name: TX8-6255-20170105.img / TX8-6255-q201-ota-20170105.zip
Build number: Amlogic/q201/q201:6.0.1/MHC19J/20170105:userdebug/test-keys
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.