Great question — answering as the UphillTech team:
You're carefully avoiding revealing any details that would give us any idea what we're dealing with, but it's probably some kind of embedded ARM device. These are not like PCs where you have plenty of choices, you can freely install any kind of OS and it will work perfectly fine or at least be usable, and the worst case scenario is you'll have to reinstall from scratch. It's quite the opposite. Devices like this are proprietary and not designed to be tampered. If it's not designed to have software modified by end user (and it's not), someone will have to find a bug that will allow for installation of 3rd party firmware. It's some custom ARM-based hardware not adhering to any particular...
Full answer by gronostaj: https://superuser.stackexchange.com/a/1566762 (CC BY-SA 4.0).
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