It is possible to downgrade, but it is destructive, you have to Wipe the device when doing it with what is called an Altboot.
Getting old firmware isn't easy though, Xerox doesn't archive firmware publicly, the latest links go to the latest firmware, so the link you got the 073.XXX.075.34540 link is the same one that would have gotten the previous version which was 072.XXX.004.09100. The new one replaces the old. So to get archive versions, you pretty much need to call Xerox and get a tech out to do it, tell them what one you want and they can grab it from an internal Xerox FTP site.
SPAR links do the same thing, the latest spar link always goes to the latest version, which as of this post, will be 073.XXX.068.33100, which is 17 versions newer than what you are running now, and probably fixes the issue you are having. If the printer was updated through CWIS, or if a clone file was used, I would suggest upgrading it to the latest with the tool installer method.
If you have a bug/glitch, that update will fix it (There is no way these printers haven't been able to authenticate since 2015 when the firmware you installed was released). Check the attachment, there have been quite a lot of Authentication things found and fixed in those 17 updates.
Plus, the new firmwares will allow you to do a Network trace (Wireshark) and you will be able to see what is causing the authentication issue on the LAN, which will probably end up being that the printers hostname changed in the update and broke its certificate
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Joe Arseneau
