The Mini 5 Pro is C0. All C0 drones from DJI are restricted to 120m.
Whats new with the Mini 5 is that you get stickers in the package with C1 on them.
Attach them to the aircraft and the contact support at Dji. You will then have 500m max altitude. This is a one way swap to C1 and once changed you cannot go back to C0
Edit. Just realised your not in UK so it may be different for you