Scroll down to get SD card content download link that suits your freedomTX version. 

If you are replacing files of the SD card of your Tango 2, please pay attention to the following:

1. RADIO folder and CROSSFIRE/EEPROM.bin contains your settings and you should not replace them. 

*Make sure you backed up the Entire RADIO folder including model.txt

2. and the files under MODEL holds all the preferences of your models, you can back them up with care.