Fnirsi Dsotc2 Firmware Guide

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? fnirsi dsotc2 firmware

Even with correct updates, issues can arise. Here is a troubleshooting table for the most frequent FNIRSI DSO-TC2 firmware woes:

| Problem | Likely Cause | Solution | | :--- | :--- | :--- | | Device won't boot past logo | Corrupted firmware or wrong HW version | Re-enter DFU mode (short test pins while powering on). Re-flash correct firmware. | | Transistor tester says "Unknown Device" for known good parts | Outdated component library | Update to latest stable firmware (V2.0.3+ includes expanded library). | | Oscilloscope shows no signal even with probe compensation | Firmware ADC calibration lost | Perform "Self Calibration" in System menu (requires floating input). | | USB not recognized by PC | Entered wrong DFU mode or driver issue | Uninstall driver, reboot, reinstall STM32 DFU driver. Use a different USB port (USB 2.0 preferred). | | Battery shows 0% but works fine | Old firmware with incorrect battery profile | Update to V2.x. If persists, perform full discharge/charge cycle. |

The internet is riddled with fake or corrupted firmware files. Only use official or trusted community-sourced repositories. Here are the primary sources:

  • Limitations often reported:

    • Unlike major brands, FNIRSI usually distributes firmware via direct Google Drive links, WeTransfer, or Telegram channels found in their YouTube video descriptions. Q1: Does updating firmware erase my saved waveforms

    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.

    There are no known open-source firmware alternatives (like Sigrok) for the DSOTC2. The ADC chip (Analog Devices AD9288) is proprietary, making reverse engineering difficult. Q2: Can I update without a microSD card

    Modern low-cost test equipment often relies on proprietary firmware that limits extensibility and transparency. The FNIRSI DSO-TC2, priced under $100, integrates a 2.4-inch color LCD, two analog input channels (10 MHz bandwidth), and a transistor/mosfet tester based on the classic AVR-Transistortester design [1]. Unlike its hardware, which uses a Cortex-M3 core (STM32F103 or clone), the firmware’s internal operation is undocumented.

    Understanding the firmware is crucial for:

    This paper describes the methodology to extract, disassemble, and analyze the DSO-TC2 firmware, and presents a structured overview of its key subsystems.

    FNIRSI occasionally posts beta firmware on their blog section. This is useful if you are chasing a specific bug fix not yet in the stable release.