After flashing the PiCroft image on my SD card using Etcher, I’m unable to boot into the operating system. I’m using my new Pi model 3B+ for this project. When I power it, the red LED starts blinking; four times fast, four times slow, in a loop. The rainbow screen appears on my monitor with a lightning bolt icon in the top right corner. I’m using a Respeaker mic-array hat for this project, so at first I thought my power supply was the problem (Official Pi charger, 5.1V 2.5A). However, after removing the hat I still couldn’t boot into PiCroft, while I was able to boot into Raspbian just fine.
I’m really having trouble figuring this out. I tried formatting and flashing the image multiple times without succes. Any help would be greatly appreciated. Thanks in advance.
Edit: The SD card I’m using came with NOOBS installed on it. Could something have gone wrong with formatting the partitions?