I tried a lot of power supply but there is always the same problems, with the unipi power supply or other with 3 A , all are stable 5V.
I used as test RPI 3 B and 4. All with bolt or baloon.
The unipi 1.1 jumers are all on the rifht side (factory default) so I use power ony by Unipi power supply shipped with the board) in the power hole of Unipi..
Have I to supply the Raspberry also with other power supply? I think is not good to do ..may be some currents goes from 2 cirtuits and may damage the RPI...