Ethos v1.5.7 and X18, X20 series User Manual
Emergency Mode
Emergency mode is the radio’s response to an unexpected event like a watchdog reset. The
watchdog is a timer that is continually restarted by different parts of Ethos. If a failure of any
kind prevents the watchdog timer from being restarted, it will time out and cause a hardware
reset of the radio. In this emergency mode the radio restarts extremely quickly, without any of
the normal startup checks so that you get back control of your model as quickly as possible.
The SD card or eMMC is not accessed in emergency mode.
Emergency mode provides only the essential functions for controlling your model but none of
the high level functions. The screen will go blank and display the words ‘EMERGENCY MODE’,
accompanied by a 300ms beep repeating continually every 3 seconds. Voice alerts, running of
scripts, logging etc. will cease operating. If emergency mode occurs, you should obviously land
as quickly as possible.
The most common cause of emergency mode is SD card failure.
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