Translations:KAVAN V20 + ETHOS™ - User manual/60/en

From KAVAN RC Wiki

Firmware

Here you can find firmware updates for the internal V20 TW-ISRM RF module, external modules and other devices such as receivers etc. From here, they can then be flashed via the external S.Port on the transmitter or wirelessly via OTA (Over The Air). The new firmware needs to be copied to the Firmware folder after putting the V20 into Bootloader mode and connecting to a PC via the USB.