restore from backup to brand new phone when beta version of ios is part of backup .how to get beta ios onto new phone

If you were running a beta on the old phone, you can not restore a backup made from that device to a device that is not running the same beta build or higher. You will have to enroll the new phone in the beta program, install the beta, then restore the backup.

You need to read the information that was provided to you when you joined the beta program. It explains all of this.

That's as much as we can say about it. Discussing beta software in the public forums is prohibited.

We (you) can't discuss about beta software in this forum.

Talk to the Apple Beta Software Program or developers forums and ask them.

Regards

Giulio

iOS is not part of the backup at all. If you want to install a beta on a new device, you must enroll that phone in the beta program the same way you did the old one.