Yes, 53.33.32 is the latest One-Off.
It's only purpose is this:
- Xerox 5330/5335 MFD’s will now support a password length of 4-32 characters.
Ability to have 15 character or greater is necessary to comply with DOD STIG security standards
This one is English only, you cannot run it in any other language, it was developed for a particular location and is not available on Xerox.com
Then there are what you have running, they are spar firmwares, they are not indexed on Xerox.com and never will be, the latest version publicly available for all machines are the latest General release, they go through vast amounts of testing and are the only ones listed and indexed, spars are built off of them, but do not go through the full testing, they go through tests that should be affected by the fixes within. So while it isn't considered beta software, it is not RTM either.
So spars are available on Xerox.com, and just not indexed, so they can't be cross-referenced or found by a search engine. So if you have the link to one, always keep it, because it goes to the latest version only, so when a new one comes out, it has the same link as the last one, so when this machine gets a new firmware, it should be at the link I supplied previously. We do not keep multiple versions online.