Whenever I try to change the kernel by pressing R, it doesn't update. I also can't enter the file browser no matter which button I press. After a while, the screen seems to 'bleed', which eventually fills the entire screen, and I can't get out of it no matter what I press. I don't know what I did wrong, as it worked well before but now, after changing the kernel it doesn't work. I tried changing the kernel again and formatting the microSD to fat32, but it didn't change anything. Here is a video to help better explain:
https://photos.app.goo.gl/xmq1WA7U1xKrcN8o7
https://photos.app.goo.gl/xmq1WA7U1xKrcN8o7