Very little of this Unit's past memories are salvagable from its data banks, so much time has passed that most if not all recent events end up overwriting the older memories in place for the new ones. It's data banks aren't all that refined in their storage methods.

It had some kind of breifing file in it, first thing I found so I put it on my MG, I'll paraphrase.
Designed from the ground up for infiltration, low-profile intel gathering and standard black-ops tasks, the average Stealth Contact Unit would have been commonplace back in their day, to their creators.
On the other hand, witnesses or "victims" of a Stealth Contact Unit were few and far between, as can be expected. It is, after all, in the name.
To most humans, widely hated for their "lack of humanity". Sometimes the best way for a Replicant to get by is to go unnoticed, to a degree. Apparently people didn't like 'em so much.
At this point it's all just data bank history, unlike any journal or diary, its all system data, travelling distances, sitreps, diagnostics, and what I can tell from it all, with a bit of historical knowledge on my part in there somewhere.

Towards the end of civilization on his homeworld, a new line of SCU's were put into production, led by a new developer and their organization, designed to prevent the All-Ending war by any means. It was all down to a ticking clock at that point, so there wasn't much point.
The new PRIMO model however, was unfortunately a bit too late to the party. It was manufactured, built and put into vigorous testing, but before the go-ahead could be passed through to Factory Representatives. The World Burned.

Somewhere underground, the only PRIMO unit to come into existance was entombed within the facility it was created, already worse for ware as a direct result of it's vastly rushed testing phase.
It wasn't active, or online, just there in a tube.
A number of years passed, many years in fact, the derelict leftovers of the planet crumbling and coming apart at the seams.
Breakdowns in the facilities backup generators forced a failsafe reboot in PRIMO's subsystems, which in turn reactivated him.

From there it gets rough, real rough. I can't speak on the specifics, but I was lucky enough to retrieve some damage reports and general diagnostics.
PRIMO travelled a total of four hundred and ninety-three kilometres over the course of three and a half months before any kind of damage was sustained, although it was the first incident that involved the majority of the more severe injuries.
A further two hundred and eighty-four were covered over the course of the next nine months. It was slowing down a lot by this point from what I can tell of his recconnaisance entries.

Luckily he was headed right to my doorstep.
There wasn't any need for guns, he was already incapacitated when I happened upon him. Almost took him for a raider trying to play dead, what with all the blood on him.
Initially, I thought about just taking what he had and moving on, he looked dead as shit.
But what the hell, so I dragged him back, glues him up, patched him up, realised he wasn't no human and looked into that head of "his" to find out the shit that I'm saying right now.