Welcome, @Mshin.2, to the community!
LoRa is a transmission method that can bridge large distances with extremely little energy. Ultra-low-power devices were specially developed for this purpose, so that they can work for a long time with a small battery or other weak energy source, for example.
The STM32L series was the first to fulfil this ultra-low power approach. An STM32F407, although very powerful, is a power waster compared to the ultra-low-power STM32L devices, which is the reason why only STM32L are currently supported by I-CUBE-LRWAN.
Nevertheless, it would be possible to port the stack to another platform, which you can certainly do yourself with the source code provided, can't you?
Regards
/Peter
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