coming back to this old discussion about regions and their potential impact on transmission power & channels due to different FCC / CE regulations.
I found a way to set the region and the next TelloFpv update will include a dialog where one can select / enter different regions.
Maybe Raul can then test if he can trick
Tello into different channels depending on the region.
I doubt anyone here has the equipment required to reliably confirm the presence of different power output modes. Range tests might give a clue but with only 19dbm vs 20dbm I doubt this can count as evidence.