Raritan DSX8 - possible to "un-brick" ?

Sorry for posting to the list, not sure where else I could ask this… Anyone have experience with these ? This is the older / EOL DSX serial console product. I have a DSX8 that seemed to happily take a firmware upgrade, and after boot hangs at a specific point in kernel output every time. I opened the case and as expected everything is soldered (no CF card or anything “easy”). They didn’t seem to put any kind of boot loader / rommon on these, so I’m not even sure if it’s possible to unbrick. Replies off-list highly encouraged as I don’t want to contribute to off-topic noise etc. Thanks.