After upgrade from 6.13 my MT on x86 shows "Loading system with initrd" and then power off. Have you any idea how to bring it back to life with previous configuration?

Trial licence expired?

No, no It's level5, commercial used system, I've upgrade it to 6.13 two weeks ago (from 5.24) whith no problems.

I have the same problem
Upgrade from 6.13 to 6.14
Shuts down after boot on different hardware

You never know where to wait for bug in Routeros

netinstall (6.14) with routeros-x86-6.14.npk (and the NTP, KVM, user-manager if you use one of that) and select "keep old configuration" before reinstall

netinstall (6.14) with routeros-x86-6.14.npk (and the NTP, KVM, user-manager if you use one of that) and select "keep old configuration" before reinstall

"keep old configuration" never worked for me saing "can not mount partition", I've reinstalled by booting from CD.

Actually this is not so fun if you upgrade router in the remote location.

This is very bad bug, confirming that guys from mikrotik have a little testing before release.
I am already was afraid of remote uprading, and with this problem this is more sad.