System Image Burning
System Image Burning
System Introduction
FlyOS-Fast is a lightweight Linux system customized for 3D printing, supporting Fly's entire series of host platforms. Its features include:
- Fast boot speed, kernel optimization ensures Klipper real-time performance
- File system optimization, reduces the risk of failure to start after power loss
- 30-second fast startup of KlipperScreen
- Pre-installed services such as Klipper, RRF, Mainsail, Fluidd, Moonraker, and KlipperScreen
- Supports switching between Klipper and RRF systems
- Supports online one-click switching between Mainsail and Fluidd
- Supports USB printing, power-off resume printing, and serial screen
- Supports automatic firmware burning on boot (fly-c8, fly-geminiv3)
- Can pre-set default language and printer name for Fluidd and other front-end UIs
If you need more OEM customization features (such as boot logo, pre-set configuration files, hiding Mainsail tab pages, etc.), please contact us.
This system is a lightweight customized system. The built-in components and services such as klipper are not the official version and are not supported for user modification or upgrade.
- The system account for FLYOS-FAST is
root
, and the password ismellow
Preparation before System Burning
-
Prepare the required devices
- If using a TF card to start the system, the following devices are needed
- Card reader
- A TF card with a capacity of 16GB-128GB, with a transfer speed of class10 level or higher.
- It is recommended to use well-known brands such as SanDisk, Samsung, and Kioxia TF cards. Do not use counterfeit TF cards!
- Windows system computer (Windows 7, Windows 10, Windows 11 can all be used)
- If using a TF card to start the system, the following devices are needed
-
Download the FLY-H3 system image:
- The current FAST version is FlyOS-FAST-V1.2.43
- Please note that you need to download the FLY-H3 image in the FlyOS-FAST-V1.2.43 folder
- Click the download link below
-
Loading...tip
- System file naming rule:
FlyOS-Fast-[chip series]-[version number].img
, for example: FlyOS-Fast-H3-v1.0.0.img - Windows system downloads
.exe
file, this file is a 7z self-extracting compressed package, after downloading, double-click to open and extract to get the.img
file (only Windows system can extract) - Other systems such as MacOS and Linux system download
.7z
file, this file is a 7z compressed package, after downloading, use a tool that supports 7z format to extract to get the.img
file - Due to the large size of the system file, other compression formats and source image downloads are temporarily not provided
- This tutorial uses
.exe
and GOOGLE drive as examples
- System file naming rule:
- Access the cloud disk, click FlyOS-FAST-V1.2.43
- Click the image you need to download
- This tutorial needs to download Fly_FAST-H3.exe
- Click still download
-
Extract the system image file to get the
.img
file.- Double-click or right-click to open FlyOS-Fast-H3.exe, after a few seconds, a window will pop up (if the system prompts it is not safe, select "More Info" -> "Run")
- You can choose the extraction directory, then click the
Extract
button, and wait for the extraction to complete.
- After extraction, a FlyOS-Fast-H3-vx.x.x.img file will be generated in the extracted directory.
x.x.x
is the system version number.
-
Install the device to be burned onto the computer
Burning the System
-
Open Rufus, select the device, the selected device should display a capacity consistent with the inserted burning card.
-
Select the
Boot Type
, which defaults toImage File
. -
Select the image file, click the
Select
button on the right ofBoot Type
, and select the extracted.img
file. -
After selecting the image file,
Boot Type
will change to the filename of the image file. -
Click the
Start
button. If a window pops up prompting to clear the disk data, clickOK
. -
After burning is complete, the computer will emit a sound, and the progress bar will show
Ready
. -
After burning is completed, do not remove the burning card immediately.
-
Open File Explorer and check if there is a U盘 or removable disk named
FlyOS-Conf
. -
Open
FlyOS-Conf
, if there are two files as shown in the picture below, it means the burning was successful. -
Install the system card on the motherboard.
Installing the System Card
- After burning the system to the TF card, connect the TF card to the back of LITE2, otherwise the system will not start

Installing the Antenna
- Install the antenna
- Please note that the host computer does not support Chinese names for WIFI, and does not support dual-band WIFI (2.4G and 5G combined)
- The place indicated by the red arrow is the WIFI antenna interface
- The WIFI antenna port is
ipex1
- Please install the antenna, otherwise it may not be able to connect to the router due to poor signal

- After installing the system card, you can proceed to the next step, connect to the host computer via SSH
- Power on the host computer.
At this point, your host computer can be started!!!
Please proceed to the next step:SSH Connect to Host Computer
Other System Configuration Options
For other system configuration options, please refer to:Modifying System Configurations