Abiquo recommends that you change the boot order by itself, without making any other disk configuration changes at the same time. Disk hot-reconfigure on ESXi only supports changes to the boot order as part of disk add or disk remove operations. Other changes made in the platform will not be implemented until the VM is powered off and reconfigured. Note that the platform will ignore Cloud-init ISO disks in the boot order.
To change the boot order:
The platform will change the boot order.