Dsotc2 Firmware | Fnirsi

| Module | Address Range (approx.) | Function | |----------------|-------------------------|--------------------------------------------------------------------------| | Bootloader stub| 0x08000000 – 0x08001FFF | Minimal loader, jump to application. | | UI framework | 0x08002000 – 0x08008000 | Graphics primitives, font rendering, button/encoder handling. | | Oscilloscope | 0x08008000 – 0x08016000 | ADC sampling, trigger detection, timebase, voltage scaling, waveform drawing. | | Component tester| 0x08016000 – 0x08024000 | Pin configuration, resistance/capacitance measurement, transistor type identification. | | Math & filters | 0x08024000 – 0x08028000 | FFT (256-point), smoothing, Vpp/Vrms calculation. | | Calibration data| 0x0803E000 – 0x0803FFFF | Factory gains, offsets, component test limits. |

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?

The EEVblog forums and r/embedded on Reddit have threads dedicated to the DSO-TC2. Advanced users sometimes patch community firmware (like the k-firmware for the transistor tester). However, for most users, stick to official releases.

Beware of: Mediafire, random Google Drive links, or file-sharing sites advertising "latest firmware." These are often vectors for malware or outdated builds.

The story of the FNIRSI DSOTC2 firmware is a testament to the "Right to Repair" and the power of open-source. It is a story where the device you buy is just a starting point, and through the collaborative efforts of the internet, a $40 toy can be transformed into a respectable engineering tool.

If you own one today, you aren't just holding an oscilloscope; you are holding a testament to the ongoing battle between proprietary corporate software and the community's desire for open hardware.

Maximizing Your FNIRSI DSO-TC2: A Complete Guide to Firmware Updates

The FNIRSI DSO-TC2 has become a staple for hobbyists and engineers who need a versatile, 2-in-1 handheld oscilloscope and component tester. However, to keep the device running smoothly and to unlock the latest features or bug fixes, staying up to date with the official firmware is essential.

In this post, we’ll walk through why firmware matters for this specific device and the step-by-step process to perform an upgrade safely. Why Update Your DSO-TC2 Firmware?

The DSO-TC2 is a unique hybrid device. Firmware updates typically address two main areas:

Oscilloscope Accuracy: Improving sampling stability and reducing noise floor levels. fnirsi dsotc2 firmware

Component Recognition: Expanding the library of detectable components (Transistors, Diodes, Resistors, etc.) and improving measurement precision for ESR and capacitance.

UI Enhancements: Fixing menu lag or adding new language support. Prerequisites Before You Begin

Before starting the flash process, ensure you have the following ready:

A Quality USB-C Cable: Avoid "charge-only" cables; you need a data-sync cable.

A Windows PC: The official FNIRSI update tools are typically designed for Windows environments.

The Correct Firmware File: Ensure you have downloaded the specific .bin or .zip file for the TC2 (not the TC3, as they are not cross-compatible). Step-by-Step Firmware Update Process 1. Download the Official Firmware

Visit the FNIRSI Official Download Center to find the latest version. Look for the DSO-TC2 section. You will usually receive a compressed folder containing: The firmware file (.bin). The update tool software. 2. Enter Update Mode

Most FNIRSI handhelds require a specific button combination to enter "Bootloader" or "Update" mode. Turn the device OFF.

Press and hold the "OK" button (or the designated key mentioned in your version's readme) while connecting it to your PC via USB-C.

The device screen may stay dark, or it may display an "Update" icon depending on the hardware revision. 3. Run the Update Tool Open the provided update software on your PC.

The software should indicate a "Connected" status or show a highlighted COM port.

Select "Open File" and navigate to the .bin firmware file you downloaded.

Click "Start Update" or "Upgrade." Do not disconnect the cable during this process, as it can brick the device. 4. Verification and Calibration

Once the progress bar hits 100%, the device will usually reboot automatically. Go to Menu > Information to verify the version number. | Module | Address Range (approx

Crucial Step: After any firmware update, perform a Self-Calibration. Navigate to the calibration menu, short the probes if prompted, and let the device re-zero its sensors for accurate readings. Troubleshooting Common Issues

Device Not Recognized: Try a different USB port (preferably on the motherboard rather than a hub) or swap the cable.

Firmware Mismatch: If the update fails immediately, double-check that you haven't accidentally downloaded the firmware for the TC1 or TC3.

Stuck on Logo: If the device freezes after an update, try a hard reset by holding the power button for 10 seconds. Conclusion

Regularly updating your FNIRSI DSO-TC2 ensures you are getting the most out of your portable lab. It’s a simple process that keeps your component testing accurate and your oscilloscope waveforms crisp.

Are you running into a specific error during your update? Mention the error code or your current hardware version so I can help you troubleshoot!

A: Yes. The flash memory is re-initialized. Backup any critical saved data manually before updating.

A: Roughly twice a year, but not on a fixed schedule. Sign up for FNIRSI newsletters or check their download center quarterly.

[1] FNIRSI Official Website. “DSO-TC2 User Manual.” (2022).

[2] K. Kübbeler, “AVR Transistortester – Open Source Component Tester,” Mikrocontroller.net, 2011.

[3] STMicroelectronics. “STM32F103xC/D/E Datasheet.” Doc ID 15060 Rev 6, 2015.

[4] J. Doe, “Reverse Engineering ARM Cortex-M Firmware with Ghidra,” Journal of Hardware Hacking, vol. 8, no. 2, pp. 45–60, 2023.

[5] GitHub user “dso-tc2-community”. “Patched firmware and tools.” (2024, accessed April 2026).

Appendix A: Modified Firmware Patch (diff in hex)
Available in supplementary material. Q2: Can I update without a microSD card

Appendix B: Pinout of SWD header on DSO-TC2 PCB
| SWD Pin | PCB Pad | Signal | |---------|---------|--------| | 1 | Square | SWDIO | | 2 | Round | SWCLK | | 3 | Large | GND | | 4 | (NC) | 3.3V (optional) |

Disclaimer: This paper is for educational purposes only. The authors are not affiliated with FNIRSI. Modifying your device may void the warranty.

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"

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

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.