A139 3CH / 2CH

Dash Cam Support

Below is a collection of everything you want to know about this dashcam, covering manuals, latest firmware, FAQs and video tutorials.


Click the flag to download the chosen manual.

Frequently Asked Questions

Having a problem with the dashcam? Scroll down to find your answer

There are 3 options for infrared LEDs: On/Off/Auto. 

It is "On" by default, and videos shall be in white and black. 

You can short-press the power button to switch between the three options.

Please note, during the day, it is normal to find interior videos a little pinkish /purple when IR LED is off.

You can refer to the explanation in the thread

The default box comes with all the indispensable accessories you need, like the car charger and GPS mount, CPL.

Optional accessories include HK3-C and fuse tap for parking mode, Bluetooth Control for remote control, VIOFO original cards,  screw bracket to prevent unauthorized unplugging, and microphone.

Constant beeping indicates recording is interruppted, most of such issues are related to the microSD card and connection. You can try the instructions below to solve the issue: 

① Format the card to FAT32 first,  try a deep formatting by. this tool if issue persists.

Micro SD Cards play an important role in dashcams, please make sure your card is among the recommended ones.

② If you use more than 1 channel, please unplug the back cameras to test if the main body can work alone.

The issue may happen in some iPhones.

Please try to disable the VIOFO APP from accessing cellular data in the setup as the pic below.

There are more TIPS related to WIFI and APP for your reference.


Yes, all channels (Front+ Rear + Interior) can work at the same time, both in driving mode or parking mode, (while you can disable interior camera recording manually by long-pressing triangle button.) 

Movement detected by one channel can trigger recordings in all active channels.

You shall need hardwire kit (HK3-C) and a pair of fuse taps in order to draw power from your car battery, you can refer to the installation videos in the below Video section.

If you use an external battery pack as a power supply, you still need our HK3-C to enable parking mode.

The transparent films are static stickers, which can be attached to your car windshield before installing the camera.

Here is a video FYI.

How To Use Static Stickers

The connection may be unstable, please try the original car charger cable and unplug back cameras.

① If main body work well alone, you can then add one back camera, please try both INT and Rear port on the main body.

②You can then switch cable, camera and port and find out which part is the cause.

There are three ways to reset the camera: 

① By buttons: Stop recording first and long press the yellow triangle and Wi-Fi button simultaneously.

② By app: Click the “Reset Camera Setting” on the app menu.

③ By Rest hole: Poke the hole on main body and hold it for several seconds until 4 led flash and the camera restarts. 

Yes, you can long-press the yellow triangle button to turn it off manually, and long-press again to enable again.

No, there is no CPL Filter for the A139 back camera.

There are three ways to format the card: 

① Quick format by buttons: Stop recording first, then long-press the REC button. 

② Click “Format SD Card” on the APP menu. 

③ Use the default format tool on your computer or download guiformat tool to format.


We suggest you format the card periodically to ensure the best performance of the camera. 

Yes, the camera supports G-sensor and motion detection. Videos triggered by them will be locked.

Here is a detailed passage FYI.

G-Sensor And Motion Detection

The maximum space it supports is up to 256GB, 128GB is a conservative choice.

Micro SD Cards play an important role in dashcams, but not all cards are suitable to be used in dashcams.

You can refer to this when choosing a card.

Get more tips in this FAQ.


How to update firmware :

Format the card first and then download the bin file to the card and power the camera with the card inserted.

Firmware Update

FWA139A.bin (45MB)
Version: V1.8_20230706

1. HDR stamps added.

2. Resolve the slowness and stuckness issues in WiFi usage.

3. Other small bugs fixed.

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