I think PSPident has to have some minimal kernel access, which means that it can only be run if it's hacked to an extent. So, ask that person to hack it and run PSPident.
... but, you can just ask what firmware and type (psp 1000, 2000, or 3000) it is because you won't really need to care about motherboard, as long as you're not trying to install an old CFW (like GEN or M33).
If it's 6.35 or above, you can temporarily hack it with either 6.35 PRO, 6.39 PRO, or 6.39 ME (LCFW version). If it's less than 6.31, you can permanently hack with 6.20 PRO. If it's a Go, you'll be able to downgrade to 6.20 regardless of what firmware it is and hack it with 6.20 PRO.
If you temporarily hack (firmware 6.35 and 6.39), your psp will cold-boot into an unhacked state and will be able to boot into hacked state through fast recovery. If you hack it with 6.20 PRO, you'll have an option to make it temporary or permanent.
If it comes with a firmware higher than 6.35, but you are unsure about it's motherboard, you can use 6.35 PRO, 6.39 PRO, or 6.39 ME (LCFW version) and then use PSPident in order to know what motherboard it is.