Firmware for FujiNet can be flashed using the easy cross platform flash program. Download the program for your operating system below. NOTE: This flash tool only supports FujiNet hardware with 8MB PSRAM and 16MB flash. If you have built your own custom FujiNet with different specs then you will need to build and flash the code manually.

This is the new FujiNet-Flasher updated Feb 27, 2022:

FujiNet-Flasher Windows x64
FujiNet-Flasher Windows x86
FujiNet-Flasher MacOS Catalina thru Monterey
FujiNet-Flasher MacOS High Sierra
FujiNet-Flasher Linux x64
FujiNet-Flasher Ubuntu 21.10

NOTE: Some Windows users have reported the FujiNet Flasher will not run on their system and shows no error message (double clicking the program and nothing happens). The way around this Windows bug is to create a new user account and run FujiNet Flasher from the new account.

You may also need to install the CP210x USB to UART driver which is available from

Connect the FujiNet to your computer with a MicroUSB cable. Ensure that your USB cable is not a power only cable. Run the flash program with elevated privileges (as administrator or root user) so that it may access the serial port. Select the correct serial port for your FujiNet then click the Flash ESP button. The latest firmware is automatically downloaded directly from the web server and installed to the FujiNet device. The log window will display the flashing progress.

Source code for the flash program is available at

TNFS Server

Pre-compiled binaries for the FujiNet TNFSD server are available below. Our custom tnfsd source code is available on Github.

tnfsd for Windows 10 64 Bit
tnfsd for Linux 64 Bit

Raspberry Pi TNFS Server Package

This Debian package can be installed on an already running Raspberry Pi OS system from the terminal:
sudo dpkg -i tnfsd_1.0-1_armhf.deb
It automatically loads the tnfsd server at boot and accesses files from the /tnfs directory. Files in this directory must be accessible to the tnfs group (chgrp -R tnfs /tnfs/* or chown -R tnfs:tnfs /tnfs/*)


Raspberry Pi TNFS Server Image

A ready to go Raspberry Pi OS disk image with configured tnfs server is available from