Qubes R4.0 advantange over R3.2 ?

[niepo...@gmail.com]

As i have internet connection problem on Qubes R4.0 that i' unable to resolve i probably back to qubes R3.2.
My question is Qubes R.4.0 significantly more secure over R3.2?
Is version R3.2 has known not resolved issues/vulnerabilities that at version R4.0 are not present?
My hardware has HVM but not IOMMU.

[Sergio Matta]

There are many advantages using 4. Look for the documentation. And it is a base for the new developments.
I was using V4 without iommu (not suported by my old chipset). I choose change my motherboard. But until there, you can use PV vms, set the networking with commands ip link, ip addr, ip route in /rw/config/rc.local e activate it with sudo chmod +x /rw/config/rc.local.