Technical Overview: FNIRSI DSO-TC2 Firmware and Hardware Architecture FNIRSI DSO-TC2
| Problem | Likely Cause | Solution | |---------|--------------|----------| | PC doesn’t detect the device | Wrong USB cable (charge-only) | Use a data-sync cable or try a different USB port. | | Update tool shows "No device" | Not in DFU mode | Repeat the "hold OK + plug USB" sequence. Sometimes you need to hold for 10 seconds. | | Update fails at 50% | Wrong firmware for hardware revision | Double-check your hardware version. Downgrade to a previously working file if possible. | | Device won’t power on after update | Corrupted bootloader | This is a brick. You’ll need an ST-Link programmer to reflash the bootloader (advanced fix). | | Touchscreen acts weird after update | Calibration lost | Go to System Settings → Calibration → Follow the crosshair prompts. | fnirsi dso-tc2 firmware
measurements for capacitors, a feature often requested by users and later addressed in subsequent models like the DSO-TC3. : The firmware-driven signal processing is limited to a 200kHz bandwidth 2.5MS/s real-time sampling rate | | Update fails at 50% | Wrong
The Fnirsi DSO-TC2’s firmware perfectly mirrors the device itself: affordable, accessible, and adequate for beginners, but ultimately limited and unpolished. It succeeds brilliantly as a component tester, thanks to open-source heritage, and just barely passes as an oscilloscope for low-frequency hobby work. Yet its closed-source nature, slow UI, and lack of advanced features ensure it will never be a professional tool. You’ll need an ST-Link programmer to reflash the
Bricking Risk: Always ensure the battery is charged before starting. Some users report units failing to boot if the process is interrupted. Oscilloscope Transistor Tester
You can find official firmware files and user manuals on the FNIRSI Manuals & Firmware Downloads page. If the file is not listed under the specific TC2 model, check the FNIRSI Official Firmware Upgrade section for general updates. Troubleshooting Tips