I am tyring to rollback a 5.5 installation update from 5.1 but shift + R on boot up does not give the 5.1 hypervisor
any idea? how do i get my 5.1 installation back?.
I did a direct upgrade using
esxcli software profile update for the upgrade
Please see the below existing threads to see if you get any help:
Downgrade ESXi 5.5 to ESXi 5.1
In addtion to it you can see the Reverting to a previous version of ESXi (1033604) | VMware KB