Community sentiment suggests FNIRSI is working on a V3.x firmware roadmap that may include:
There are also rumors of a "Pro" hardware revision with a higher 10MS/s sampling rate. If released, expect a separate firmware branch.
Until then, the current FNIRSI DSO-TC2 firmware ecosystem is mature and stable. By keeping your device updated, you ensure that this $60 oscilloscope-tester combo punches well above its weight class.
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?
This is the most critical section for anyone searching for "how to update FNIRSI DSOTC2 firmware."
Ghidra (version 10.4) with ARM Thumb support was used to decompile the firmware. We defined:
Hardware debug ports (SWDIO, SWCLK) are present on the PCB but not locked in production units. Using an ST-Link v2, we read the external flash via OpenOCD:
openocd -f interface/stlink-v2.cfg -f target/stm32f1x.cfg -c "init; dump_image fw_dump.bin 0x08000000 0x40000"
The dump matched the official update binary (excluding header).
FNIRSI provides a .bin firmware update file via their website. Using standard tools (binwalk, hexdump), we examined the 520 KB binary.
Key findings:
The FNIRSI DSO-TC2 is a remarkable tool for the bench, but its soul is the firmware. Whether you are a hobbyist testing a salvaged capacitor or a technician chasing a glitchy signal, an outdated firmware build is a bottleneck you cannot afford.
By following the steps in this guide—identifying your hardware revision, sourcing clean firmware from official channels, executing a safe flash, and post-calibration—you will unlock the full potential of your device. Keep a bookmark of FNIRSI’s support page, and consider joining the EEVblog forum thread dedicated to the DSO-TC2 for the latest news on beta releases.
Your oscilloscope is only as smart as the firmware it runs. Update wisely, update safely. fnirsi dsotc2 firmware
Have you updated your FNIRSI DSO-TC2 recently? Share your experience or ask troubleshooting questions in the comments below (or on the official FNIRSI forum).
The FNIRSI DSO-TC2 is a 3-in-1 device that functions as a digital oscilloscope, transistor tester, and PWM signal generator. Firmware updates for this device typically focus on refining these core functional areas rather than adding entirely new secondary applications. Core Firmware-Enabled Features
The firmware manages the device's three primary operation modes: Digital Oscilloscope:
Bandwidth & Sampling: Real-time sampling rate of 2.5MS/s and an analog bandwidth of 0–200kHz.
Triggering: Includes Auto, Normal, and Single trigger modes with adjustable trigger levels and edge detection (rising/falling).
Waveform Analysis: Displays real-time measurement parameters such as Vppcap V sub p p end-sub Vmaxcap V sub m a x end-sub Vmincap V sub m i n end-sub Vavgcap V sub a v g end-sub , and frequency. Transistor Tester:
Automatic Identification: Automatically detects and measures NPN/PNP transistors, FETs, diodes, thyristors, and passive components like resistors, capacitors, and inductors.
Pin Definition: Automatically parses pin definitions and displays them on the 2.4-inch color screen.
Extended Testing: Supports IR code parsing (NEC protocol), Zener diode measurement (up to 24V), and DS18B20/DHT11 sensors. Signal Generator:
PWM Output: Provides a dedicated PWM square wave output with an adjustable frequency (1Hz to 80kHz) and duty cycle (0–100%). Firmware Update Process
Official firmware and manuals can be found on the FNIRSI Download Center. The general update procedure involves:
The FNIRSI DSO-TC2 is a versatile tool that combines an oscilloscope and a transistor tester, but users often find that a firmware update is the "final boss" in unlocking its full potential. The "Two-Mode" Challenge
One unique aspect of the DSO-TC2 firmware is that it often requires two separate updates because of its dual nature: CH Upgrade (Oscilloscope Mode):
To update the oscilloscope side, you connect the device while it's and wait for a drive named to appear on your computer. MM Upgrade (Transistor Mode):
Updating the tester side requires a different "secret" handshake: you must press and hold the down arrow key while powering it on until a drive named A Common Troubleshooting Tale
Many users encounter a "ghost drive" issue where the device appears as a USB drive but won't allow files to be copied or shows no space. A helpful trick discovered by the community is to perform a "Fast Format" Community sentiment suggests FNIRSI is working on a V3
on the appearing drive (usually via Windows Explorer) before dragging the new firmware files over. The Rewards of the Journey
Upgrading is often described by users as "reviving" or "revitalizing" the device. Beyond just bug fixes, updates can lead to: Better Visibility:
Improved fonts and clearer labels on the oscilloscope screen. Improved Stability: Reduced lag and better waveform stability.
Transforming a "stuck" device that won't boot past the logo into a fully functional tool again. For the most reliable files, it is best to visit the Official FNIRSI Firmware Download Page
rather than relying on third-party links that might host corrupt files. for the CH or MM upgrade process? FNIRSi DSO TC4 Firmware upgrade
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.
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:
To update the firmware on your FNIRSI DSO-TC2 (a 2-in-1 digital oscilloscope and transistor tester), follow the standard "CH UPGRADE" process used for FNIRSI handheld devices. Firmware Update Instructions Preparation : Ensure the device is turned off Type-C data cable that supports data transfer (it must have D+ and D- lines). Enter Upgrade Mode
Connect the DSO-TC2 to your computer using the USB cable while the device is still powered off. Wait approximately
after the device boots up automatically or after pressing the power button once (depending on the specific hardware revision). Mount the Drive : Your computer should recognize a new removable disk named . If it does not appear, disconnect and repeat the steps. Transfer Firmware Download the official firmware from the FNIRSI Software Downloads
Copy the firmware file (typically starting with "CH") and paste it directly onto the "CH BOOT" drive. Completion : Once the transfer is finished, an "Update completed"
message will appear at the bottom of the DSO-TC2 screen. The device will then restart with the new firmware version. Troubleshooting Tips Cable Issues
: If the "CH BOOT" drive doesn't appear, try a different USB cable. Many charging cables do not support the data transfer required for firmware flashing. Hardware Variants
: Some users report that entering the upgrade interface requires holding a specific button combo (like the "OK" or middle button) while powering on, though the standard TC2 manual specifies the off-to-on connection method. before starting the update? There are also rumors of a "Pro" hardware
Note: This is a conceptual/reverse-engineering analysis paper, as FNIRSI has not officially released full source code for the device.