updating from CentOS7.3 to CentOS7.4 rendered one of our laptops unbootable. EM:
Failed to open \EFI\BOOT\grubx64.efi – Not Found Failed to load image \EFI\BOOT\grubx64.efi: Not Found start_image() returned Not Found
How could this occur because of an update and how to fix this?
What I tried is booting from CentOS usb, chroot to /mnt/sysimage and gave command:
efibootmgr –create –label CentOS –disk /dev/sda1 –loader “\EFI\CentOS\shim.efi”
This gave no EM, but booting remains impossible.
I have to say I don’t know whether to try grub2 of efibootmgr commands.
Any help would be very much appreciated.