First and foremost, you should ideally be looking to keep your servers in their support lifecycle with Microsoft, purchasing Windows Server 2012 Extended Security Updates (ESUs) should really be a last resort as newer operating systems have more modern security
Server 2008 R2 Won’t Boot – The boot selection failed because a required device is inaccessible 0xc000000e
We had an issue today where a number of servers wouldn’t boot after being patched, they were showing the above error “The boot selection failed because a required device is inaccessible 0xc000000e”. It actually happened to 3 out of 10