So... I hit my first obstacle, and now I'm stumped, lol

So....
I'm at v2.1_update1... Could someone please point me to some form of upgrade file that will work?
For reference: http://forum.gtvhacker.com/revue/topic393.html
(the guide from here that I tried to follow.. Went ahead and tried it anyway, since seemingly no one on the internet HAS that 55579 version, and it fails the has/checksum, assuming that is part of the issue of trying to update from 55579...?
Also wondering.. Did these units have a 'standard' product ID sticker or anything? On the bottom there's a decent sized indent, but there are only two stickers there, a MAC and a serial number.. No logitech sticker with a formal model number or anything.. I ask because on the front of the unit, there is a while label maker printed label which reads "developer edition". Sticker totally looks like from one of those Brother P-Touch type, so I'm 99% sure it was done by the previous owner, and not something unique and special from Logitech, but still.. The lack of a formal part number/model number on the bottom makes me curious..
Will continue searching the forums here, but would really appreciate some help on this in the form of working file locations or any other input. Read there was a gtv group working on modded firmware - Maybe that would be an option? Only the wiki claimed it to be more of a proof of concept and not necessarily functional..? Willing to try anything

EDIT: Still haven't found any files.. Tried usb flashing/recovery mode using B51795 as well as B54202, both located from a wiki, one claims bad signature, the other claims the update.zip is not a supported file (paraphrasing).. Neither build are the minimum stated to be needed however..
I did manage to get it to get past all the com logitech.harmony errors during setup.. After it verified a network connection (which you can't skip) and verified the "latest version" (again, I'm only running 2.1_update1, says that's the latest) I unplugged the network. It whirred a bit, think it spit an error, but then finally said congratulations it was going to reboot and save the configuration.. Got the gui now, but still spitting errors at me from logitech like listed above. Wondering if the 3.1/3.2 update will resolve that?
My build number (is not listed in any wiki/database??) is: ka2x-20101123.200533.user-b41819. Not sure why there's no listing of it?

As an aside - For those who still have this unit - What are you doing with it these days?