I upgraded my laptop’s BIOS today. I wish I hadn’t. After the upgrade the bootloader believed that there wasn’t enough memory to load any operating system. I tried other bootloaders, and they all thought the same.
The IBM telephone support guy was helpful and clueful, which is unusual for someone in his type of job. Maybe IBM have a policy to not employ grumpy idiots. It would be good if some other IT companies would copy that idea.
I reinstalled the old bootloader.