Hi Sistemas-cmic,
As you have rollback your MTU setting? could you try to power on the old VCenter?
Also, could you do a esxcli vsan cluster get from command line on one host ? and check the unicast agent list?
Configuring vSAN Unicast networking from the command line (2150303) (vmware.com)
I guess, If the vsan hosts can communicate between them from VSAN traffic, the VMs and vsan datastore should be accessible as your rollback your MTU settings.
