So is this method work ?
1. format sd card with ExFat
2. create *.txt file called ncdo.txt
3. enter into ncdo.txt file:
66 63 63 for 1000mW mode
6d 69 64 for 500mW mode
followed by SHA256 value of your Mavic Mini serial number.
You can use online SHA256 generator to turn your serial number...