The “B” model appears to be the model with the bandwidth upgraded from 4 GS/s to 4.2 GS/s.
Therefore, the AWG710 software may not work.
My AWG430 HDD has a folder called setup.inf, which seems to allow me to select from AWG400, 500, 600, 700, and MTG300. Maybe it can be used just by changing it, but the “B” model is not mentioned.

(Don't worry about the three folders. No need. Just a tried and true Windows generated file.)
I have an AWG430 and the digital part seems to be identical.
anyone have an AWG710B, please use the DD command in Linux to get a complete copy.
VxWorks is very dependent on the order in the sectors of the boot file.
Also, the motherboard used in this system has quirks and will get stuck unless the proper system is installed after POST.
It was a long time ago and I don't remember much, but Maxtor MaxBlast or Ontrack DiskManager (could have been Hitachi) had the ability to write an MBR that bypassed the 8.4GB limit.
I used that, installed DOS, using software provided by VxWorks to write system files, and copied the AWG software.
This is a very difficult and tedious process.
There are two drives inside, one is a 32MB SSD (converted from PCMCIA to IDE) for the system and the other is a 10GB TravelStar for the user area.
It does not matter what the contents of the HDD in the user area are. If it is damaged, it will be formatted during the self-test when the AWG software starts.
The user area HDD must be present to boot. An error will occur during the self-test.
As I was writing this, I remembered.
The software that copies the VxWorks system files is “vxsys.com”. Attached.