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BIGTREETECH Pi 2 uses the higher performance quad-core A55-RK3566 chipset. It consists of rich interface functions, a built-in eMMC5.1, onboard support for 2.4G/5G dual-mode, and WiFi transmission speeds of up to 433.3Mbps. It also supports the Bluetooth BT5.2 version. It has the same mounting hole positions as the Raspberry Pi; therefore, installation and use are convenient and quick.

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Features Highlights

  • CPU: Rockchip RK3566, quad-core Cortex-A55 @1.8GHz
  • GPU: Mali-G52 1-Core-2EE
  • NPU: 0.8 TOPS NPU
  • RAM: 2GB LPDDR4 (customizable: 1GB/2GB/4GB/8GB)
  • Onboard eMMC 32GB (customizable: 8GB/32GB/64GB/128GB...)
  • MIPI DSI display support (320P-1080P 60Hz)
  • SPI Flash: Customizable W25Q256JWEIQ
  • Dual-lane MIPI CSI-2 Camera Interface (320P-1080P 60Hz)
  • 3x USB 2.0 ports, 1x USB 3.0 port
  • PCIe 2.1 1x1 Lane (Supports M.2 2242 4PIN+5PIN)
  • MicroSD card slot (SDIO2.0)
  • Networking: Gigabit Ethernet, 433Mbps WiFi, BT 5.2
  • Audio: 3.5mm jack to support mic input
  • Capacitive mic input
  • 40-pin GPIO header
  • HDMI 2.0 OUT (480P-4K 60Hz)
  • Onboard infrared receiver (38kHz)
  • Same mounting hole positions as Raspberry Pi
  • 24V DC power input


Dimensions 93.8mm x 56mm
Installation Hole Spacing 58.2mm x 49.4mm
USB-C Input DC 5V±5%/2A
Output Voltage 3.3V±2%/100mA
WiFi 2.4G/5G, 802.11 ac/a/b/g/n/ wireless standards
Bluetooth 5.2


Peripheral Interface

Interface Diagram

Interface Introduction

Power Supply


· UBS-C: DC 5V 2A

· Terminal Block: DC 12-24V

40 pin GPIO

The method for calculating GPIO pins is as follows:

GPIO4_B2 = (GPIO4 - GPIO0) * 32 + (‘B’ - ‘A’) * 8 + 2 = 4 * 32 + 1 * 8 + 2 = gpio138

GPIO3_D7 = (GPIO3 - GPIO0) * 32 + (‘D’ - ‘A’) * 8 + 7 = 3 * 32 + 3 * 8 + 7 = gpio127


Specifications: HX5P-2.54MM horizontal type, compatible with our company's SKSM emergency power supply board.

Specification model: W25Q256JWEIQ (NOT included. If needed, please contact us for customization.)



Default position is OFF, which means the eMMC can be used normally. If you do not wish to boot from eMMC, switch the EMMC-EN position to ON. This will short the eMMC signal lines to GND and disable eMMC boot.


To enable OTG mode, switch the OTG KEY to the ON position. (Note: The black USB 2.0 port will not function properly in this mode.)




Flashing the System

Download the System Image

Only use the image provided in the link:

Write System to MicroSD Card

1、Download the balenaEtcher software from [], install, and run it.

2、Insert the MicroSD card via a card reader.

3、Select your downloaded image.

4、Select the MicroSD card and click "Flash" (WRITE the image will format the MicroSD card. Be careful not to select the wrong storage device, otherwise the data will be formatted).

5、Wait for the process to complete.

Writing System onto eMMC

Using RKDevTool to Write the eMMC (Windows)

Download and unzip RKDevTool from the GitHub repository ( to your computer. DO NOT insert aMicroSD card.

1、As shown in the diagram below, toggle the USB OTG switch to the ON position. At this position, the USB OTG port is connected to a Type-C port. Set the eMMC switch to the OFF position, allowing the RK3566 to access the eMMC normally.

2、Hold down the “Recovery” button, then connect the BIGTREETECH Pi 2 tothe computer using a Type-C cable. Power on and after 3 seconds, release the button.

3、 Install the driver:

① In “Device Manager”, if you see “Unknown Device”, it indicates that the computer is missing drivers.

② Open the DriverAssistant tool in the downloaded RKDevTool folder, click “① Uninstall Driver”, then click “② Install Driver” to ensure that the latest version of the driver is installed.

③ After the installation is complete, hold down the “Recovery” button, replug the Type-C cable. "Device Manager" should now recognize a “Rockusb Device”, indicating that the driver installation is successful.

4、Open the “RKDevTool” software:

Note: The parameters in the software are set by default as shown in the image. Normally, you only need to set the “④ actual path of the .img system”. If the parameters in your software do not match those in the image, manually adjust them to match.

① Find the path where the downloaded RKDevTool is located.

② Open the RKDevTool tool.

③ The software will recognize a “LOADER” or “MASKROOM” device.

④ Select the system to be written (the OS image must be unzipped as a .img file beforehand; RKDevTool does not support directly writing compressed .xz files).

⑤ Check “Write by Address”.

⑥ Click “Run” to start writting the system.

⑦ “Download image OK” indicates that the system has been successfully burned.

5、After writing is complete, toggle the USB OTG switch to the OFF position to boot normally. Note: Files on the eMMC cannot be accessed by the computer like those on a MicroSD card, so you cannot modify the system.cfg configuration file to set up the WiFi network. Instead, use an Ethernet cable or USB-to-UART connection to configure the terminal.

Writing System onto eMMC Using a MicroSD Card

As shown in the figure, toggle the eMMC switch to the OFF position so that the RK3566 can access the eMMC normally.

First, write the system onto a MicroSD card, then insert the MicroSD card into the board's card slot, and wait for the system to boot.

Connect to the system's terminal via Ethernet, WiFi, or USB to UART. Log in with the following credentials:

login: biqu

password: biqu

Execute the command sudo nand-sata-install. In the interface that pops up, select "2 Boot From eMMC - system on eMMC" and then select "OK"

① Select "Yes" to start erasing and writing the system onto the eMMC.

② Choose the filesystem "1 ext4" and then select "OK".

③ Wait for the writing process to complete.

④ Upon completion, you will be prompted whether to power off. Select “Power off” to shut down the system.

⑤ After the system has powered down, disconnect the power supply, remove the MicroSD card, and then reconnect power. The system should now boot from the eMMC.

Erasing eMMC

When using a MicroSD card as the system card instead, it's best to erase the data on the eMMC to prevent the motherboard from booting from it by mistake.

Using RKDevTool to Erase eMMC (Windows)

1、Refer to the steps in "4.3.1 Using RKDevTool to Write the eMMC (Windows)" to connect the motherboard to the computer.

2、Open the "RKDevTool".

① Find the path where the downloaded RKDevTool is located.

② Open the RKDevTool.

③ The software will recognize a "LOADER" device. If it recognizes "MASKROOM," it indicates there is no data in the eMMC, hence no erase operation is necessary.

④ Click "Advanced Function."

⑤ Click "EraseAll" to begin erasing data from the eMMC.

⑥ "Erasing sectors success" indicates the erasure is complete.

Erasing eMMC After Booting from MicroSD Card

1、Refer to the steps in "4.3.2 Writing System onto eMMC Using a MicroSD Card" and log into the system terminal.

2、Run the command sudo mkfs /dev/mmcblk1 and then enter "y" to confirm.

System Configuration

Using Ethernet

Ethernet is plug-and-play and requires no additional setup.

Setting Up WiFi

After the system image has been written, the MicroSD card will have a FAT32 partition recognized by the computer. In this partition, there is a "system.cfg" file. Open it and replace "Your SSID" with your actual WiFi name and "YourPassword" with the actual password.

Configuring Overlays

Open the "armbianEnv.txt" file in the BOOT partition and set the values for overlays. The configuration file supports only one line of overlays at a time; if multiple overlays are enabled, only the last line will take effect. If you need multiple overlays, place the contents of multiple configurations on the same line separated by a space. For example, if you need to use a DSI screen, MCP2515 SPI to CAN module, and I2C1 simultaneously:

overlays=dsi mcp2515 i2c1

Configuring the Display

1、Open the "armbianEnv.txt" file in the BOOT partition.

2、The default overlay is set to "hdmi," meaning the system uses an HDMI screen by default. This can be changed to match the actual screen being used, such as:

· "hdmi": HDMI screen

· "dsi": DSI screen

· "tft_35": SPI Screen


For "tft_35", there is also a "tft35_spi_rotate" parameter for system-level screen rotation, with default "0" meaning no rotation, other options include "90", "180", "270".

Note: Only one screen type can be used at a time.

3、To configure KlipperScreen, open the system.cfg file in the BOOT partition. Set the screen type with the parameter ks_src, and the rotation angle with ks_angle.

Using SPI to CAN

Open the "armbianEnv.txt" file in the BOOT partition and add "mcp2515" to the overlays configuration.

Using CSI Camera and Crowsnest Configuration

For both RPi v1.3 ov5647 and RPi v2 imx219 cameras, no specific configuration in "armbianEnv.txt" is required as they are plug-and-play. "crowsnest.conf" file configuration is as follows:

device: /dev/video0 # The CSI camera node is fixed as video0

custom_flags: --format=UYVY # The current system's CSI camera does not support the default YUYV, so it needs to be set to the supported UYVY format.

Using Bluetooth

1、 To scan for Bluetooth devices, enter the following command, and a list of Bluetooth devices will appear as shown below:

bluetoothctl --timeout 15 scan on

2、Find your Bluetooth device, for example, if your device name is "HONOR xSport PRO", locate the corresponding Bluetooth MAC ID as shown below.

3、To connect to a Bluetooth device, enter the following command, connection success is shown as below

bluetoothctl connect E0:9D:FA:50:CD:4F

① If there's an issue while connecting, as shown below, please restart the Bluetooth device and repeat steps 1 and 2 to connect.

② If there's an issue while connecting, as shown below, please enter the following commands and then repeat steps 1 and 2:

bluetoothctl remove E0:9D:FA:50:CD:4F (Your Bluetooth device's corresponding MAC ID)

rfkill block bluetooth

sleep 3s

rfkill unblock bluetooth

pulseaudio -k

pulseaudio –start

4、If you exit voice playback during the use of Bluetooth and cannot reuse it, manually delete the corresponding playback process. Use the ps command to view the process number, then use kill -9 process_number to delete the corresponding playback process.

Setting up 3.5mm Headphones Port

1、Enter the command: aplay -l

Check for the corresponding sound card, as shown in the image (the sound card for the headphone port shown in the image corresponds to card 0).

2、Enter the command:

amixer -c 0 contents (0 represents the card 0 found in the previous aplay -l command)

Check the settings for playback and recording channels, as shown in the image.

3、Enter the command:

amixer -c 0 cset numid=1 3

Set the playback channel, as shown in the image.

4、 Enter the command:

amixer -c 0 cset numid=2 1

Set the recording channel, as shown in the image.

5、Enter the following command to play audio, with the audio file directory xxx and the audio file name xxxxx.wav:

aplay -D plughw:0,0 /xxx/xxxxx.wav

6、Enter the following command to record (where 10 represents recording for 10 seconds), storing the recording in directory xxx, file name xxxx.wav:

sudo arecord -Dhw:0,0 -d 10 -f cd -r 44100 -c 2 -t wav /xxx/xxxx.wav

7、Enter the following command to play the recording:

aplay -D plughw:0,0 /xxx/xxxx.wav

SSH Connect to Device

1、Install the SSH software Mobaxterm:

2、After powering on, wait for the system to boot, which typically takes about 1 to 2 minutes.

3、Once the device is connected to WiFi or an Ethernet cable is plugged in, it will automatically be assigned an IP address.

4、Access the router management interface to find the device's IP (it should be BTT-CB2 here).

5、Open Mobaxterm and click "Session", and click "SSH", inset the device IP into Remote host and click "OK" (Note: your computer and the device needs to be in the same network).

6、Login as: biqu password: biqu


1、About 10 seconds after powering on, the system enters the kernel phase. At this time, the blue light stays on, and the green light flashes continuously, indicating that the system is running normally.

2、Root administrator:

​ Login: root

​ Password: root

​ BIQU user:

​ Login: biqu

​ Password: biqu

3、The PCIe M.2 interface does not support hot-plugging; the solid-state drive must be connected in advance for the device to be recognized.

4、When booting from eMMC, do not insert a MicroSD card. When booting from a MicroSD card, it is necessary to erase the data in the eMMC.


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