DJI drones with a C0 marking flying in the UK were locked to 120m towards the beginning of January this year as a result of changes to UK legislation on 1 January 2026. The “Request Higher Altitude Limit” link should have appeared at the same time.
The link obviously achieves nothing as DJI withdrew the ability to change the class of the Mini series drones from C0 to C1 last year (reportedly, after pressure from EASA).