Raspberry Pi 0 was stuck at rainbow image on hdmi output and was not booting. Both dtbs are needed _and_ the enable_uart=1. Any of them missing leaves RPI0 stuck at the rainbow image.
Raspberry Pi 0 was stuck at rainbow image on hdmi output and was not booting. Both dtbs are needed _and_ the enable_uart=1. Any of them missing leaves RPI0 stuck at the rainbow image.