The contents of the SD card can be browsed from within the Taranis radio by using the built-in SD Card Browser using the path: Main Screen –>(LP Menu)–>Radio Set Up 1/8 –>(SP Page)–>SD Card 2/8 .  Text files can be displayed, Lua scripts can be executed, and the bootloader can be upgraded from a firmware .bin file.  Many of the operations offered are DELETE options, so be careful in here.  You do have a backup of your SD Card contents don’t you?