I was playing with the freeflight6 app and found some settings for altitude limitation.
I am not sure if this is safe and if this is going to be recovered during the flight.
During about 10 flights tested, Force FCC modification worked without any errors on my phone(LG G7).
When I tested with Galaxy tab S4, video stram was not recovered during rth. I think it is a compatability issue with samsung devices.
anyway, I am going to test the new altitude limit this week :]
It is allowed to fly higher than 150m if there are tall buildings around in my country.