In the world of affordable, multi-function electronic test equipment, the FNIRSI DSO-TC2 has carved out a unique niche. It is not just a digital oscilloscope; it is a hybrid device that combines a 2.5MS/s oscilloscope with a transistor tester (based on the classic AVR-Transistortester design). For hobbyists, makers, and electronics repair technicians, it offers incredible value for money. However, like any sophisticated piece of firmware-driven hardware, its performance, accuracy, and feature set are entirely dependent on one critical component: the FNIRSI DSO-TC2 firmware.
Keeping the firmware updated is not merely about adding new flashy features—it is about ensuring measurement accuracy, fixing software bugs, improving boot times, and enhancing the transistor tester’s component recognition libraries. This article serves as the ultimate resource for understanding, sourcing, updating, and troubleshooting the firmware on your FNIRSI DSO-TC2.
A: Roughly twice a year, but not on a fixed schedule. Sign up for FNIRSI newsletters or check their download center quarterly.
If you want, I can:
Official firmware for the FNIRSI DSO-TC2 Go to product viewer dialog for this item.
is primarily distributed via the manufacturer's official support page. The device features a unique upgrade method where it acts as a USB analog U-disk (virtual drive) when connected to a computer, specifically for flashing update files . Official Downloads
FNIRSI Support Center: Access the latest firmware files and software on the FNIRSI Software Downloads page Manuals: Detailed PDF guides for the are available on Manuals+ and Scribd . Firmware Update Procedure To update your
firmware, follow these general steps based on official documentation:
Preparation: Download the firmware package (often in .bin format) from the official site .
Connection: Ensure the device is powered off, then connect it to a computer running Windows 10 or above using a USB-C data cable .
Enter Update Mode: Press the power button once (or as specified by the version-specific guide) to enter update mode. The computer should recognize the device as a removable USB drive .
Transfer: Copy the firmware file directly onto this virtual drive. The device will typically process the update automatically upon receiving the file .
Reboot: Once the transfer is complete, disconnect and restart the device to finalize the installation . Key Device Capabilities (Updated Firmware)
The current firmware supports a variety of integrated diagnostic functions:
FNIRSI DSO-TC2 is a handheld 2-in-1 digital oscilloscope and transistor tester. Updating its firmware can fix bugs, improve component detection accuracy, or add new UI features. Official Firmware Resources
Firmware and software for FNIRSI products are primarily hosted on their official support pages. Official Manuals & Firmware Downloads
: This is the central repository for user guides and firmware packages for all FNIRSI devices. Software Downloads Page
: Visit here for PC-side software often required to facilitate the upgrade process. Firmware Types for DSO-TC2
The DSO-TC2 contains two distinct firmware files because of its dual-mode nature. According to the FNIRSI DSO-TC2 User Manual , you must upgrade these individually: CHD Prefix : Firmware for the oscilloscope portion of the device. CHT Prefix : Firmware for the transistor tester portion of the device. General Update Instructions fnirsi dsotc2 firmware
While the specific key combination for the DSO-TC2 can vary by hardware revision, the general FNIRSI workflow typically involves the following: Enter Upgrade Mode
: With the device off, hold a specific button combination—commonly the buttons or —then connect it to a PC via USB. Mount as USB Drive
: The device should appear as a removable mass storage drive on your computer. Transfer Files : Drag and drop the firmware file into the root directory of this drive. Complete Installation
: Once the file is copied, safely eject the drive and restart the device. The unit will typically auto-install the file and reboot with the new version. Troubleshooting Common Issues Device Not Recognized : Ensure you are using a USB cable that supports data transfer , not just charging. If it still fails, check the Windows Device Manager
to ensure the CH340 or CH341 serial drivers are correctly installed. Blank Screen
: If the screen remains blank after entering upgrade mode, you may need to format the virtual drive before dragging the firmware file. Firmware Verification : After updating, navigate to the menu on the device to verify the version number. exact step-by-step button sequence for a specific hardware revision of your DSO-TC2?
The FNIRSI DSO-TC2 is a 2-in-1 handheld digital oscilloscope and transistor tester. Updating its firmware involves a specific dual-process because the device contains two separate components—the oscilloscope and the transistor tester—each requiring its own firmware file. Firmware Identification
The firmware files are distinguished by their prefixes. You must ensure you are using the correct file for the specific component you wish to update: CHD Prefix: Firmware for the Digital Oscilloscope part. CHT Prefix: Firmware for the Transistor Tester part. Update Procedures
The DSO-TC2 does not support bulk updates; you must perform these steps separately for each component. 1. Oscilloscope Firmware Upgrade (CH UPGRADE) Ensure the device is powered off.
Connect the device to a computer using a Type-C data cable (ensure it supports D+/D- data transfer). Boot the device and wait approximately 2 seconds.
A removable disk named "CH BOOT" should appear on your computer.
Copy the firmware file (starting with CH) into the "CH BOOT" disk.
Once the copy is finished, an "Update completed" message will appear at the bottom of the device's screen. 2. Transistor Tester Firmware Upgrade (MM UPGRADE)
Start with the device powered off and connected to the computer via Type-C cable. Press and hold the Down Arrow key, then turn the device on.
Hold for about 2 seconds until a disk named "MM BOOT" appears on the computer. The screen should also display "MM Boot" in the lower-left corner.
Copy the firmware file (starting with MM) into the "MM BOOT" disk.
The system will automatically restart once the upgrade is complete. Essential Requirements & Troubleshooting
Cable Quality: Use a high-quality USB-A to USB-C data cable. Users have reported that USB-C to USB-C connections often fail to trigger the update mode. In the world of affordable, multi-function electronic test
Official Downloads: Firmware files and the full user manual can be found on the FNIRSI Official Download Page.
OS Compatibility: While most modern systems work, some users recommend using Windows 10 or 11 for the most reliable connection.
Safety Warning: Always discharge capacitors before measuring them with the tester to prevent hardware damage, which is a common cause of failure in earlier TC2 units.
You're referring to the FNirsi DSO-TC2 firmware!
FNirsi DSO-TC2 is a popular, affordable, and open-source oscilloscope and signal generator project. The firmware is a crucial part of the project, and I'll provide an overview of its features and updates.
FNirsi DSO-TC2 Firmware Overview
The FNirsi DSO-TC2 firmware is based on the STM32 microcontroller and provides a range of features, including:
Firmware Features and Updates
The FNirsi DSO-TC2 firmware has undergone several updates, which have added new features and improved performance. Some notable updates include:
Key Features of the Latest Firmware
The latest firmware (V1.6) offers several key features, including:
Flashing the Firmware
To update the FNirsi DSO-TC2 firmware, users need to download the latest firmware version from the official GitHub repository and follow the flashing instructions. The process typically involves:
Conclusion
The FNirsi DSO-TC2 firmware is a remarkable example of open-source hardware and software collaboration. The firmware offers a range of features, including oscilloscope and signal generator functionality, data acquisition, and a user-friendly interface. With regular updates and improvements, the firmware continues to enhance the capabilities of the DSO-TC2 device. If you're interested in learning more or contributing to the project, I encourage you to explore the official GitHub repository and documentation.
Updating the firmware on your FNIRSI DSO-TC2 Go to product viewer dialog for this item.
is a critical maintenance task that can fix bugs, improve measurement accuracy, and sometimes even add new features to this versatile 2-in-1 device. This guide covers everything from finding the official files to the step-by-step installation process. Where to Download FNIRSI DSO-TC2 Firmware
Official firmware and software updates are hosted on the FNIRSI Software Downloads Page. A: Roughly twice a year, but not on a fixed schedule
Official Website: Navigate to fnirsi.com and check the "Manuals & Firmwares" or "Downloads" section.
File Types: Firmware files for this device typically come in two parts:
Prefix "CHD": Refers to the Digital Storage Oscilloscope (DSO) part of the software.
Prefix "CHT": Refers to the Transistor Tester (TC2) part of the software.
Version History: While FNIRSI does not update their older models as frequently as newer ones (like the TC3 or TC4), community resources on Facebook groups or Reddit often track the latest unofficial fixes or stable builds. Preparation Checklist Before starting the update, ensure you have the following:
Since the FNIRSI DSOTC2 is a hardware device (an oscilloscope), "the story" of its firmware is not a traditional narrative with a beginning, middle, and end. Instead, it is a technical drama playing out in the workshops and online forums of electronics enthusiasts.
Here is the story of the FNIRSI DSOTC2 firmware, broken down into chapters.
The DSO-TC2 main board contains:
Firmware resides in external flash, with a bootloader in MCU’s internal ROM.
Q1: Does updating firmware erase my saved waveforms?
Q2: Can I update without a microSD card?
Q3: My PC doesn't have an SD card slot – can I use a phone?
Q4: FNIRSI DSOTC2 firmware vs. DSOTC1 – are they compatible?
Q5: How often does FNIRSI release updates?
Unlike major brands, FNIRSI usually distributes firmware via direct Google Drive links, WeTransfer, or Telegram channels found in their YouTube video descriptions.
Method A: The Official YouTube Channel This is the most reliable source.
Method B: Rebrand Sources (DDS140) Since the DSOTC2 is a clone of the Miniware DDS140, you can sometimes use Miniware firmware, but this is risky.
Method C: Community Archives The EEVblog forum has a massive thread dedicated to these oscilloscopes.