Sådan rettes 120m højdegrænsen på en Kina-importeret DJI Mini 4 Pro, der flyver i Japan

Ved LauThomas · 02 Jul 2026

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Situation:how to fix the 120m altitude limit on a china imported dji mini 4 pro flying. This guide answers the specific situation first, then connects the reader to Reboot Hub's verified pre-owned buying path.

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Why Does a China-Imported DJI Mini 4 Pro Lock to 120m in Japan?

Every DJI Mini 4 Pro—whether purchased in Shenzhen, Hong Kong, or Tokyo—runs identical hardware. The firmware, however, reads the aircraft's GPS coordinates at power-up and enforces the local altitude regulation stored in DJI's geospatial database. In Japan, the Civil Aeronautics Law imposes a blanket 120-meter (394-foot) ceiling on all uncrewed aircraft weighing less than 100g, while the Mini 4 Pro at 249g falls under the same category when flown recreationally without special permissions. China-imported units often arrive with a default 500m limit set for the Chinese mainland, but the moment the drone locks enough satellites over Japanese soil, the DJI Fly app switches the maximum altitude to 120m—exactly what Japanese law requires. This is not a defect; it's DJI's built-in compliance mechanism. That said, some users report a persistent 30m limit or a frozen slider after an international move. This typically indicates a stale firmware cache or a GPS module that isn't properly handing off the region change. Reboot Hub's pre-owned inventory undergoes a multi-point inspection that includes a forced region-lock test in our Shenzhen lab, so every Flawless or Pristine unit shipped to Japan arrives with a clean GEO handshake—no stuck sliders, no firmware rollbacks required.

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Hvor meget koster det lovligt at låse op for højder over 120m i Japan?

Raising the 120m cap for a specific mission is free through DJI's Fly Safe portal, but you must supply documentation from the Japan Civil Aviation Bureau (JCAB) or the relevant local authority. Most pilots seeking authorized high-altitude access apply for a JCAB flight permit, which costs ¥0 for the administrative filing but may require 7–14 business days for approval. Once the permit is obtained, sumit a Custom Unlock request at fly-safe.dji.com: select your Mini 4 Pro, upload the JCAB approval, and set the exact coordinates, radius, and temporary altitude ceiling (typically 150–300m). DJI then pushes a digital certificate to your account, valid for 1–90 days. The entire process is $0. If you skip the JCAB step and attempt to fly above 120m without authorization, the aircraft will physically refuse to ascend—no software workaround exists. For pilots who encounter a hardware-related lock (e.g., a faulty barometer that spits out erroneous height data), Reboot Hub offers a flat-rate diagnostic and repair service. Our Shenzhen facility fixes GPS, IMU, and barometer issues on the Mini 4 Pro for $95 (HKD 740), including OEM parts and a 3–5 day turnaround. This is a true chip-level service handled by MOHRSS Level 3 technicians—not a software flash.

Relateret:Sverige Drone Import Skatteberegner fra Kina: Tullverket Gu

Ny vs Brugt DJI Mini 4 Pro: Hvad er smartere for japanske operationer?

Køb af en brugt Mini 4 Pro inde i Japan garanterer en regional firmware, der øjeblikkeligt respekterer 120m-grænsen, men mærkatprisen er høj. En frisk Fly More Combo sælges for ¥119.900 (ca. $800 / HKD 6.250) hos indenlandske elektronikkæder. Reboot Hub's brugt-enheder, klassificeret Flawless (A+) eller Pristine (A), giver en direkte rabat, mens de leverer den samme overensstemmelse, når dronens region er indstillet til Japan. Tabellen nedenfor sammenligner de reelle omkostninger for en Japan-bundet operatør.

Every Reboot Hub A+ and A unit undergoes the same multi-point check that verifies GPS acquisition, barometer stability, and complete Japan GEO compliance. You receive a drone that behaves exactly like a domestically purchased one—including the 120m automatic limit—but at a 35–40% lower cost. DDP shipping from our Hong Kong hub means no customs surprises at Narita or Haneda; import tax and duties are already factored into the price.

What If My China-Imported Mini 4 Pro Shows a 30m Limit Instead of 120m?

A 30-meter ceiling on a Mini 4 Pro flying in Japan almost always points to a corrupted Home Point or GPS acquisition failure. The drone falls back to a conservative altitude enclosure when it cannot confirm the region. Start by refreshing the firmware through DJI Assistant 2 (Consumer Drones Series) on a PC: connect the aircraft, click the update icon, and allow the full refresh to overwrite the internal region cache. This takes 8 minutes on average and costs $0. Next, perform an IMU and compass calibration in an open field far from metal structures. If the limit persists, the issue is likely a failing GPS ceramic patch antenna or a micro-crack in the mainboard's GPS trace—common after a hard landing. Reboot Hub's chip-level repair lab in Shenzhen diagnoses and replaces these components for $95 (HKD 740) with a flat 3–5 day turnaround. We use only genuine DJI OEM parts pulled from donor boards that pass our multi-point electrical test, and we offer a 180-day warranty on the entire repair. Customers in Hong Kong can use our free drop-off point; from Japan, we recommend DDP shipping both ways to eliminate border delays.

Hvorfor købe fra Reboot Hub?

Reboot Hub isn't a generic liquidator. Every pre-owned DJI Mini 4 Pro we sell passes a multi-point inspection that covers vision sensors, gimbal calibration, battery cycle count, and—critically—GPS region handshake under simulated international flight conditions. We use only genuine OEM replacement parts, never third-party batteries or shells. You get a 180-day warranty that matches or exceeds new-buy guarantees from many regional resellers. DDP shipping from our Shenzhen/Hong Kong facility means the price you see is the price you pay: no extra customs paperwork, no 10% consumption tax shock at the post office. If you ever need a repair—whether for a stuck altitude lock, gimbal overload, or mainboard corrosion—our in-house technicians hold MOHRSS Level 3 certifications and complete most jobs in 3–5 days. For Japan-based pilots, Reboot Hub provides a clear, lower-risk path to owning a compliant, like-new Mini 4 Pro at a fraction of retail.

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Q: Will a China-imported DJI Mini 4 Pro automatically set the correct 120m limit in Japan?

A: Ja. DJI's GEO-system aflæser flyets GPS-koordinater og håndhæver Japans 120-meter højdeloft i det øjeblik, det opnår en positionsbestemmelse. Der er ingen grund til manuelt at ændre en regional indstilling; firmwaren gør det automatisk. Hvis du oplever en grænse på 30m eller 500m, skal du straks udføre en firmwareopdatering. Reboot Hub's brugt-enheder leveres med firmwareversion 01.00.0700 eller nyere, som indeholder den fulde Japan GEO-database, så overgangen er problemfri.

Sp: Hvordan ansøger jeg om en DJI højdeoplåsning over 120m i Japan?

Sv: Besøg fly-safe.dji.com, log ind på din DJI-konto, og vælg Custom Unlock. Indtast dit Mini 4 Pro's-flyveleders serienummer, koordinaterne for dit planlagte flyveområde, og upload det officielle JCAB-flyautorisationsdokument (PDF). DJI behandler de fleste Japan-oplåsninger inden for 24-48 timer uden beregning. Den midlertidige oplåsning kan indstilles til en radius på op til 30 km og en højde på op til 500m, men kun i den varighed, der er angivet i din JCAB-tilladelse. Forsøg aldrig at flyve over 120m uden denne godkendte oplåsning; flyet vil nægte at stige op, og du risikerer juridiske sanktioner.

Spørgsmål: Kan Reboot Hub forhåndslåse højdegrænsen op, før jeg sender min drone til Japan?

A: We can pre-configure your drone's region to Japan to ensure the 120m limit engages correctly, but a permanent unlock above 120m is neither legal nor technically possible. DJI's system requires a time-bound digital certificate tied to your account and a JCAB permit. Reboot Hub will, however, guarantee that your pre-owned Mini 4 Pro arrives with clean Japan GEO data, all firmware updates, and a properly functioning GPS module—zero stuck sliders. If you later need a repair for an altitude-lock hardware fault, our Shenzhen lab handles it in 3–5 days for $95 (HKD 740).

Spørgsmål: Er det lovligt at flyve en Mini 4 Pro over 120m i Japan med en DJI oplåsning?

A: Kun hvis du har en gyldig JCAB-flyvetilladelse til den specifikke dato, tid og luftrum. Fritidsflyvninger over 120m er forbudt uden undtagelse. Selv med en JCAB-autorisation skal du også overholde lokale luftrumsrestriktioner, lufthavnsudelukkelseszoner og regler for befolkede områder. DJI-oplåsningen er blot en teknisk nøgle - den erstatter ikke juridisk tilladelse. Reboot Hub råder på det kraftigste alle Japan-baserede piloter til at fuldføre den gratis MLIT online-registrering og til enhver tid bære det Remote ID-kompatible registreringsnummer på dronen.

Q: Hvad er ekspeditionstiden for en Mini 4 Pro højdelåsreparation ved Reboot Hub?

A: Our Shenzhen chip-level facility completes altitude-related repairs (GPS module, barometer, mainboard trace repair) in 3–5 business days from receipt of the drone. The flat-rate cost is $95 (HKD 740), which includes genuine DJI OEM components, full recalibration, and a 180-day warranty on the repair. Hong Kong customers enjoy a free drop-off at our Kwun Tong location. Japan-based customers typically ship via DDP courier, with round-trip transit adding approximately 5–7 days.

Sp: Dækker Reboot Hub's 180-dages garanti fejl i højdegrænsen?

A: Absolut. Hver Flawless A+ eller Pristine A Mini 4 Pro, der sælges af Reboot Hub, er dækket i 180 dage mod defekter, der påvirker flyveydelsen, herunder GPS-låsefejl, barometerdrift og GEO-database-handshake-fejl. Hvis din enhed ankommer ude af stand til at vise Japan 120m grænsen korrekt eller udviser et falsk 30m loft, reparerer eller erstatter vi det uden ekstra omkostninger. Denne garanti understøttes af vores interne MOHRSS Level 3-teknikere, som kun bruger originale OEM-dele.

Q: Hvor lang tid tager DDP-forsendelse fra Reboot Hub til Japan, og er der ekstra gebyrer?

A: DDP (Delivered Duty Paid) shipping from our Hong Kong distribution center to major Japanese cities takes 4–7 business days. The price displayed at checkout is final—import consumption tax, customs clearance fees, and courier handling charges are all included. There are no hidden cash-on-delivery demands. We ship via SF Express or FedEx with full tracking, and every parcel is insured for its full value. A tracking number is provided within 24 hours of dispatch.

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