I've traveled multiple times to the B in bric with mine without issue but that might have been before it got famous. Seems like Anatel confirmed they don't consider it homologated, and thus, technically illegal to import/sell there. Chances are it gets in but not out.

The flipper one is closer to a Raspberry pi, if the LoRa and Wifi are in homologated modules it would be perfectly legal to carry around. If not, it would be on the same rule of the zero and illegal.