I didn't find a solution, it looked like a change of the host that affected network. Rerunning from USB with latest beta kept showing an upgrade.
Network reset did not fix it and the machine was laggy, like when I tried to join from XO ( via settings ).
I just did a complete reinstall, disabled HA on the NFS SR, joined pool and it worked and re-enabled HA.
Seems ok now, thanks for the help.
By the way, is there a way to join a node to the main pool in XO ?
Thanks!