I am doing my first session with the Zynthian right now and I get constant underpower warnings.
I am using the v3 kit with a rpi3b+. I am using an USB power supply which should give 3A and I tried another one which says it can give 4A max. But both are more or less quite cheap china products and result in underpower warnings.
Can someone suggest a supply which I can buy in Germany and which might also work with rpi4.