Comment 62 for bug 1861936

@Matt I didn't find any special way to easily select between kernels on raspberry - installing the linux-{headers,image}-<version>-raspi2 would overwrite whatever was on the FAT partition, making it the kernel loaded on next boot. To revert to previous kernel, its package would need to be reinstalled (apt install --reinstall <pkg>).

I did run into a problem where a tested kernel wouldn't boot, so I'd recommend making a backup of the FAT partition in advance so you can recover it outside of the Raspberry's OS session.