Hi Dave, Nick,

First of all thanks foyr quick response.

Let me start by saying i fixed it, but i had to take another route then Dave suggested.

I already read about the

chroot /mnt/sysimage
cd /
cp -a /boot/efi/EFI/centos/* /boot/efi/EFI/clearos/
exit
reboot

part, but i couldn't do a chroot /mnt/sysimage. Something about not able to do or not able to find (not sure eactly what it said).

So i decided to try copy it on a different way. I booted not from the Clearos rescue anymore but from one of my other rescue USB devices (yay, lucky me, that i recently created and updated one). From ther i tried several different tools, but in the end with pmagic i could mount the sysimage amongs other partitions. Then i did copy the grubx64.efi file from Centos folder to Clearos.

After that a reboot presented me with the latest and some previos kernels.

First i Choose the newest, but at a certain point it took me to a rescue prompt (not seen that one before), so i decied to boot into the previous kernel.

Then i could boot my Clearos server fine again, i just thought lat's give it another go and run the update to the latest kernel again.

No problems after that anymore and also Samba was working fine again!

@Nick,

Normally only default (none test) repo's are the ones i am using, but when i saw in my console the update for Samba and i tried to update, my system complained about missing depenedencies, regarding libtevent and libldb.

so installed only those two with:

yum --disablerepo="*" --enablerepo="centos-unverified" install libtevent and yum --disablerepo="*" --enablerepo="centos-unverified" install libldb

After that the samba update ran without a problem with the default repo's.

My grub version at this point is: grub2-2.02.1-0.76.v7.1.x86_64