So I recently bought a batch of RIM 850 devices and managed to get most of them to turn on. They are all running on this custom OS I have never seen before. Looks like it is RIM OS v2.5 but stripped really hard and replaced with software for drivers to log their shipments, breaks, pick ups etc. Thought I'd share before wiping the devices and installing the latest OS.
https://youtu.be/VICPVjecArM