Trying to unlock bootloader if phone not European?

I've bought a used G4 from someone who is "pretty sure" (but not 100% certain) that it's a European model, as it was purchased from a seller on Amazon shortly before the phone was released in the UK.

I want to root the phone, so my question is: if I try to unlock the bootloader using the official LG method, but the phone turns out NOT to be a European model, am I likely to brick the phone?