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.

Latest Firmware Version Info:

FujiNet Version: 0.5.f8cc4292
Version Date/Time: 2022-01-03 23:24:24
Build Date/Time: Mon Jan 3 23:36:05 UTC 2022
4149676f599ed44f27258a96b6532e00bca7d67e600284623f351dd6471499c8 spiffs.bin
c41e3c63bc73717cb42f33c6ff52e2bfbd1ca78c4f67c1a59a0b8afd8cfa0ba2 firmware.bin
d25d8a06c2dddbd1c8e97484a0a36425ed4169f56a4196cca6f72e938542e7d8 partitions.bin
83d287cabef90517b249341300e1954b6d7edf94f2d98d2d0bc3398ed9d87a6a bootloader.bin
f94c5d786a7a8fab06ac5d10e33bf37711a6697636dc037559ea19cc410a17f0 boot_app0.bin
Git Commit: 0e67e974

View Commits Since Last Build

[0e67e974] Merge branch 'master' of
[a1f424d0] Fix mounting from webui bug
[ea1bf57e] rename functions.
[2cc14ee9] get prefix.
[117ad0b3] set prefix header.
[a2777793] temporarily comment out sniffer for adam.
[21acfb8e] add mount all to adam.
[c830a8f9] add set prefix

FujiNet-Flasher Windows x86
FujiNet-Flasher Windows x64
FujiNet-Flasher MacOS Catalina 10.15
FujiNet-Flasher Linux x64

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. 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.

All the firmware files are available individually at

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