Ethos v1.5.7 and X18, X20 series User Manual
The X20/S/HD series requires an SD card that is 32gig or less formatted fat32. SanDisk
Ultra Micro SDHC Class 10 16gig cards are a good option. Files will be on the FRSky
website.
The X18 and X20 Pro/R/RS radios use an internal eMMC card for file storage by default, but
an external SD card may be added. Tap on the ‘Radio’ tab to explore the eMMC card
memory.
The system will create some of the folders if the user does not create them, like Logs,
Models and Screenshots. The Firmware folder was created manually to keep device firmware
like receivers, etc.
SD Card drive path when connected to a PC:
SD Card (drive letter)/ or
RADIO (drive letter)/ {radios with internal eMMC card}
The top level folders are:
audio/
This folder is for audio files.
audio/en/gb English voice
audio/en/us American voice
audio/en/default default voice
These folders are for user sound files, which can be played by the 'Play audio' special
function. Refer to the Model / Special Functions section, and also the Choice of Voices
section.
The format should be 16kHz or 32kHz PCM linear 16 bits or alaw (EU) 8 bits or mulaw
(US) 8bits. There may be 31 characters in the names of wav files plus extension.
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