DJI A3 Upgrade Kit (A3 to A3 Pro)


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Triple Modular Redundancy 

The A3 Pro* is equipped with three IMUs and three GNSS units, with additional analytical redundancies for a total of six redundancies. Working together with advanced diagnostic algorithms, if the A3 Pro detects GNSS or IMU unit failure during flight, it seamlessly switches to another unit to maintain reliability and precision.
*Upgrade the A3 to A3 Pro by installing 2 upgrade kits.


Precision Fault-Tolerant Control

The new attitude determination and multi-sensor fusion algorithms improve the A3’s control accuracy. The robust control algorithm enables the A3 and A3 Pro to be adapted to a wide range of aircraft without the need for manual tuning. With a fault-tolerant control system, a hexacopter or octocopter can land safely even in the event of propulsion system failure.


Industry Solutions and SDK Compatibility 

The A3 series provides industry solutions with D-RTK GNSS, smart ESCs and Lightbridge 2. With Onboard and Mobile SDKs, custom-built applications can access flight data and control the aircraft, gimbal, and camera. Dedicated hardware interfaces including CAN and API ports allow industry experts to craft their ideal aerial system by adding actuators and sensors.


Next Generation DJI Assistant 

The brand new DJI Assistant 2 is powerful yet simple, making it easy to set up a variety of DJI aerial systems. A new, built-in flight simulator ensures that complex moves can be practiced in advance without risking the aircraft, and a completely overhauled Ground Station supports touch screen interaction, offline mission design, route planning and even formation flight for multiple aircraft.



Triple Modular Redundancy
Precision Controls with Fault-Tolerance
Compatible with D-RTK GNSS, Smart ESCs, Intelligent Batteries, and Lightbridge 2
DJI SDK Compatibility
Precise Configuration with DJI Assistant 2

Product Specifications


Weight A3 Pro: 386g
A3: 186g
Power Consumption A3 Pro: Max. 16W
A3: Max. 8W
Size Controller: 64mm x 42mm x 19.5mm
PMU: 51mm x 34mm x 13.5mm
External IMU: 34mm x 26.5mm x 20mm
GPS-Compass Pro: 61mm (diameter) x 13mm 
LED: 27mm x 27mm x 8mm
Built-in Functions:
Built-in PMU
Intelligent Flight Modes
Low voltage protection
DJI Smart Battery Protection
Motor overload detection
External SBUS receiver
Lightbridge 2 receiver
8 function channels (including 4 configurable direction channels)


Flight Performance 

Maximum Wing Resistance: <10m/s
Max Yaw Angular Velocity: 150 deg/s
Max Tilt Angle: 35°
Ascent/Descent Ascent: 5m/s 
Descent: 4m/s
SDK Mobile SDK 
Onboard SDK


Extending Function 

PWM I/O Ports: F1-F4 ports for output F5-F8 ports for I/O function
iOSD Data Storage Built-in data recorder
Ground Station It can be realized in DJI GO APP With Lightbridge 2, and in PC Ground Station with Lightbridge 2 or DATALINK PRO.
Intelligent Flight Modes: (with Lightbridge 2) Point of Interest, Waypoints, Home Lock and Course Lock.
Remote Parameter Adjustment: It can be realized in DJI GO APP With Lightbridge 2
PC Assistant: DJI ASSISTANT 2, support simulator




In the box

Flight Controller x 1
GPS-Compass Pro x 1
LED Module x 1
PMU x 1
GPS Mounting Bracket x 1
LED Mounting Bracket x 1
CAN-Gimbal Cable x 1
Micro USB Cable x 1
Servo Cable x 5
DBUS Cable x 1
Screw Pack x 1
Cable Tie x 3
Double Sided Adhesive x 4


By buying from Ferntech, you'll have the confidence that you are dealing directly with New Zealand's leading drone experts. Our staff are knowledgable drone pilots who offer expert advice, trusted support and superior specialist service. Only through us will you receive a full New Zealand warranty, phone and email support, and access to our certified Repairs Centre with DJI-qualified drone technicians. And we guarantee that we will have the best prices on the market — if not let us know and we will match any price (conditions apply).


Warranty Details

MC: 12 Months
IMU: 12 Months
PMU: 12 Months
LED: 12 Months
GPS: 6 Months


Software Settings

What should I do if the flight controller doesn’t connect to DJI Assistant 2?

a. Make sure that the drivers and DJI Assistant 2 are correctly installed. 
b. Make sure all the cables are connected to the correct ports on the flight controller. The device running the DJI Assistant 2 should be connected to the USB port on the LED module. 
c. Make sure the flight controller is powered on. 
d. Try other USB ports or other USB cables.



What should I do if there is no response from the motors when I pull the control sticks?

a. Make sure you are pulling the control sticks correctly. 
b. Check the status of the flight controller in DJI Assistant 2. If any problem is found, follow the instructions on screen to fix it. 
c. Confirm that the entire travel of the control stick is mapped to its corresponding channel, and in the correct directions. 
d. Confirm that the ESC is working properly and that it is compatible with your flight controller. 
e. Confirm that the remote controller is successfully linked with the aircraft.



What should I do if the aircraft flips over after taking off?

a. Confirm that the orientation of the flight controller is correct. 
b. Confirm that the orientation of IMU is consistent with the directions set in DJI Assistant 2. 
c. Confirm that rotation direction of the motors and propellers are correctly matched. 
d. Confirm that the ESCs are connected to the correct ports. 
e. Confirm that the aircraft type is correctly set in DJI Assistant 2. 
f. Calibrate the ESC throttle range (if using a third-party ESC).



What should I do when the aircraft’s attitude starts to drift mid-flight?

a. Check if the aircraft’s center of gravity is correctly balanced. 
b. Check if the GNSS’s center of gravity is properly set in DJI Assistant 2. 
c. Check if the propellers are level.



What should I do if DJI Assistant 2 fails to shut down when the Micro SD card is locked in Read mode?

Restart the flight controller.


What should I do if a switch fails to function after calibrating the remote controller?

Re-calibrate the remote controller by centering all the tap positions in DJI Assistant 2. Failure to do so may prevent certain channels from functioning properly after calibration.



What are the functions of the P, A, F, and M modes in DJI Assistant 2?

P-mode (Positioning): GNSS and Vision Positioning Systems are used for precise positioning in this mode. 
A-mode (Attitude): GNSS and Vision Positioning Systems are not used for holding position. The aircraft only uses its barometer to maintain altitude. If it is still receiving a GNSS signal, the aircraft can automatically return home if the remote controller signal is lost and if the Home Point has been recorded successfully. 
F-mode (Function): Intelligent Orientation Control is activated in this mode. 
M-mode (Manual): GNSS and Vision Positioning Systems are not used for holding position and no barometer is used to maintain altitude. Only use this mode in an emergency.



What should I do if I can’t install DJI Assistant 2 on my Windows 7 computer?

1. If your operating system is Windows 7, you need to download the usbser.sys file, place it in the C:\WINDOWS\system32\drivers folder, and then reinstall the DJI WIN Driver. 
2. Click here to download the usbser.sys file.




What should I do if DJI Assistant 2 unexpectedly closes and restarts, and gives the error message “DJI Assistant 2 already running!”?

Terminate the Root.exe process and then restart DJI Assistant 2.


What should I do if the LED turns red after a firmware update?

The flight controller will be locked after upgrading the firmware as the parameters are reset. You can unlock the flight controller in DJI Assistant 2.


Hardware Installation Questions 

What ESCs are the A3 flight controller compatible with?

The A3 series is compatible with standard 400Hz ESCs with 1520US center points.


Do I have to disconnect the red cable when using a third party ESC with the A3?

If the ESC supports BED, then the red cable should be disconnected.


Where should I install the IMU module and how far should it be from the center of gravity?

It should be installed near the center of gravity. Please keep it away from other electronic devices, such as the GNSS module, receiver, ESC, etc.


Are the CAN1 and CAN2 ports interchangeable?

No, the CAN1 port supports the A3 module and other DJI equipment whereas the CAN2 port supports SDK equipment.


Does the A3 flight controller support the first generation Lightbridge HD video downlink or other similar video downlink equipment?



Does the A3 flight controller support iOSD data storage devices?

The iOSD storage device is built into the A3 flight controller and the iOSD parameters are displayed when used with the Lightbridge 2.


How do I use the Intelligent Flight Modes on the A3?

Course Lock, Home Lock, Point of Interest and Waypoints are available when using the A3 with Lightbridge 2 and the DJI GO app. These can be activated through DJI GO.


Does the simulator support third-party remote controllers?

Yes, you can use third-party remote controllers equipped with S-BUS ports with the simulator.


Is the PPM receiver compatible with the A3 flight controller?



Does the A3 flight controller support third-party remote controllers to control the gimbal system when used with the Lightbridge 2?



Which gimbals are supported by the A3?

Zenmuse Z15 A7/GH4/5D III/BMPCC/XT/X3/X5/X5R.



What is the iESC port on the A3 flight controller used for?

It is used for communicating with DJI’s intelligent ESC and for firmware upgrades. Currently, it is only used with the DJI M600.


Does the A3 flight controller support the DJI SDK?

Yes, it supports both the Mobile SDK and the Onboard SDK.


What are the advantages of the D-RTK GNSS kit?

It supports high precision positioning with vertical accuracy up to 0.02m + 1ppm, horizontal accuracy up to 0.01m + 1ppm, magnetic immunity, and high precision navigation information.


Can the A3 flight controller work at low temperatures? What is the operating temperature range?

It can work from -10 °C to 45 °C.


What is the maximum wind speed the A3 can withstand when used with the S900?

The maximum wind speed resistance is 10 m/s.


How does the A3’s triple modular redundancy indicate system abnormalities?

The GNSS/IMU modules are equipped with LED indicators. Green blinking and blue blinking means the system is working normally, while red blinking indicates anomalies. To check system failures, launch DJI Assistant 2 or the DJI GO app and follow the steps displayed on screen.


Why are the LED lights blinking red and yellow?

The LED will blink red and yellow alternately if the compass data is abnormal during operation. Calibrate the compass to resolve the issue. If the LED lights still blink red and yellow after compass calibration, it may be due to magnetic interference from the environment at your current location. Change to a different flight location.


How do I determine which IMU and GNSS are currently being used?

Look at the LED on the IMU and GNSS modules. If the LED is green, then that module it currently being used. If the LED is blue, then that module is ready for use.


Under what circumstances will the triple modular redundancy switch on?

a. If you manually switch it on in the DJI GO app. (Lightbridge 2 is required) 
b. If the currently used IMU module is malfunctioning, the system will automatically switch to a backup module. 
c. If the currently used GNSS module is malfunctioning, the system will automatically switch to a backup module. LED indicators will quickly blink blue if the switch is successful.



Does the A3 have propulsion system fail protection?

Yes. The propulsion system fail protection on the A3 requires the following conditions: 

a. Thrust-to-weight ratio over 2.5. 
b. Hexacopter or octocopter aircraft. 

Note: If the aircraft starts spinning after motor fail protection kicks in, the aircraft will automatically switch to Course Lock mode.


Can I use the A3 without GNSS?


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