Hi,

At present, EdgeTX has discovered the problem, after the Nand flash manipulation code caused possible loss of Settings data, EdgeTX has changed the code, EdgeTX has also changed the new declaration, and has released the latest Nightly firmware, you can follow the following steps to update the firmware to make GX12 work stably.

In the off state or no power state, plug in the USB, hold down the SG button on the left shoulder, and then press the power button again, it will automatically enter the DFU mode, you can directly use EdgeTX Buddy to update the firmware, you can easily update the firmware in this way.

When you use a Windows PC to update the firmware, you need to replace the driver with the DFU device STM32 Bootloader, otherwise EdgeTX Buddy will not recognize the STM32 chip.
Check out this description and download the ImpulseRC Driver Fixer driver installer:
https://edgetx.org/faq

You can then smoothly update the Nightly firmware of GX12 using EdgeTX Buddy.

Kind regards,

Radiomaster support team