The 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
Use a high-quality data transfer cable. Avoid "charge-only" cables.
Firmware is the internal software programmed into a device that controls its hardware and allows it to function. For the DSO-TC2, the firmware determines everything from the accuracy of its component measurements and oscilloscope trigger sensitivity to the user interface's responsiveness and available features. A firmware update can provide significant benefits: fnirsi dsotc2 firmware
: 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.
Extremely important: Only download firmware intended for the DSO-TC2. Using firmware from a different FNIRSI model could cause irreversible damage to your device. The is a 2-in-1 handheld digital oscilloscope and
Run the driver installer (often named CH341SER.EXE or similar, depending on the onboard USB-to-UART chip). Follow the on-screen prompts to complete the installation. Step 3: Boot the DSO-TC2 into Upgrade Mode
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. Avoid "charge-only" cables
: This step is crucial. With your DSO-TC2 powered off, connect it to your computer using the USB-A to USB-C data cable.
Once the copy is finished, the device may show an "Update completed" message. Unplug the cable and restart the unit to finalize the installation. Pro Tips for a Smooth Update
The device should display "Firmware Update Mode" or a blank screen, indicating it is ready to be flashed.