The encrypted STM32 baseband firmware is a file whose extension is .xgf in the '/usr/firmware' directory in your X6100; for instance the one for the latest version is called 'X6100_BBFW_V1.1.8_240915003.xgf'.
You can also find it in the sdcard.img file from a Xiegu X6100 upgrade zip; it is in the second partition under '/usr/firmware'.
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Franco
