Built a fresh raspi3 arm64 image through cdimage (20190122.2) containing flash-kernel 3.90ubuntu3.18.04.1. Booted up the image, logged in, ran flash-kernel, saw no errors (kernel and bootscript updated successfully), rebooted and the image was still bootable. Considering this bug as verified.
Please note that there will be a follow up flash-kernel upload later.
Built a fresh raspi3 arm64 image through cdimage (20190122.2) containing flash-kernel 3.90ubuntu3. 18.04.1. Booted up the image, logged in, ran flash-kernel, saw no errors (kernel and bootscript updated successfully), rebooted and the image was still bootable. Considering this bug as verified.
Please note that there will be a follow up flash-kernel upload later.