Hello my name is Jonathan and i am one of the Engineers here at the Cisco SBSC team. I apologize for the inconvenience, indeed a new firmware version was release recently and it is 1.4.5.2 for this units, if you get access to the link below the latest boot code is inside the zip code that has the version 1.4.1.3 and the boot should be 1.3.5.6, I understand your concern and i will get this feedback to our team.
If you need further assistance feel free to give us a call at 1-866-606-1866. thanks and have a great day.
https://software.cisco.com/download/release.html?mdfid=283019669&softwareid=282463181&release=1.4.5.02&relind=AVAILABLE&rellifecycle=&reltype=latest