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To enter into this mode, turn the Taranis radio off. So for example this mode is a fast way to change both the OpenTX Bootloader and the main firwmare to the same version. In this mode the whole OpenTX firmware gets written to the radio, that means that both OpenTX Bootloader and OpenTX main radio firmware get written. The OpenTX Companion (with appropriate driver) can use this mode and can read and write OpenTX firmware to the radio. The FLASH is the non-volattile storage space where OpenTX firmware gets written.
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In this mode, with appropriate software, one can have a full control over the whole FLASH area of the Taranis radio. This mode should always work regardless of what the user has done/flashed to the radio. This is a good thing and means that Taranis radio can not be "bricked".
![zadig stm32 driver mac zadig stm32 driver mac](https://oscarliang.com/ctt/uploads/2017/07/betaflight-gui-firmware-flasher-dfu-com-port.jpg)
It is a part of the "silicon firmware" and can not be erased or damaged in any way. This mode is built in into the STM32 CPU that is in the radio. Mode 1: The factory installed STM32 DFU Bootloader If for whatever reason the Mode 2 is not working, then use other options (either Mode 1 or the methods that do not use the USB connection).
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For the average user who wants to update firmware or edit models and settings from the OpenTX Companion the Mode 2 is recommended (OpenTX bootloader), because it should not require any additional drivers to be installed on the computer. The Taranis radio has three ways of connecting to computer by USB port, each gives different end result.