After upgrade kernel grub corrupted

[Satish Patel]

We have HP DL360e G8 Server and it has CentOS 7 installed and running
but as soon as i install new kernel with yum install kernel and reboot
machine my grub get corrupted and drop me in "grub>" then i did
following to bring system back

grub>set root=(hd0,msdos1)
grub>linux16 /vmlinux-<old kernel> root=/dev/sdx rw
grub>initrd16 /initramfs-XXXXX
grub>boot

But i didn't find new kernel when i did <tab><tab> so i boot with old
kernel and look into grub.conf file i can see new kernel there.

Then i did following to re-install grub, but it didn't work too.

grub2-install /dev/sda

And same issue happening on my all server not single machine, I have
tried to upgrade BIOS too but its on latest version, on server iLO i
check and found "System ROM Bootlock" don't know what is that which is
running on older firmware but i didn't find any firmware for that
anywhere.

Do you think it's hardware issue, if it's then how older version of
CentOS7 get installed which is "3.10.0-514.el7.x86_64" ?