Interesting, thanks.
For the interest of anyone reading this later.
I figured out a way around the write erase on the VMM. By taking out the master redundancy and the erasing the old secondary, I was able to successfully restore the flash on the master. Then I just brought the old secondary back online.
Unfortunately, somewhere in the process, both of the controllers locked up.and I'm left with this.
Type Model Status Configuration State Config ID
---- ----- ------ ------------------- ---------
master ArubaMM-VA up UPDATE SUCCESSFUL 79
MD Aruba7240XM down CONFIG PROPAGATION 136
MD Aruba7240XM down UPDATE REQUIRED 136
standby ArubaMM-VA up UPDATE SUCCESSFUL 79
Since my connections are both to the first port, I thought I might be in luck for ZTP if the boxes were cycling, but as it turns out, neither one is in activate for some reason, and with the box locked up I can't get the activation ID to do a manual entry. Sigh.