I would handle it the following way:
1. have a technician from Xerox do a "Forced ALTBOOT, no data backup no clone" to the latest firmware (starts with 072, not 071), It is a complete redo of the Firmware conyaining many improvements and fixes. The only downfall is that it can't be done as an upgrade, it is essential to do the full load. Have a configuration page ready because all settings would need to be put back manually, a clone file *will* not might break the system as the 2 platforms are too different.
2. Should option 1 fail, the next step is to get the old firmware and have the same process from step 1 done again to force the downgrade, this is not a suggested workflow, because any issue on older firmware you come across cannot be sent to Engineering without confirming it still exists in the newer firmware levels, and in that case, it would be resolved on the new, not the older. If your tech cannot obtain the firmware through his regular channels, call Xerox, explain you need 2nd level, when you get to 2nd level you will need to get escalated to "Discovery", if anyone can get the older firmware, it will be found there. (No garantees)
Sorry, I have nothing further.