If you experience critical issues, you may roll back to v2.0.9 using the "Legacy Recovery" mode. Note that rolling back will erase all user profiles.
[DOWNLOAD FIRMWARE v2.1.4] | [VIEW RELEASE NOTES] | [CONTACT SUPPORT]
© 2026 DSOTC2 Dev Team. Specifications subject to change without notice.
The FNIRSI DSO-TC2 is a versatile 2-in-1 device that combines a digital oscilloscope with a multi-component transistor tester. Keeping its firmware up to date ensures you have the latest bug fixes, improved measurement accuracy, and new features. Prerequisites for Firmware Update Before starting, ensure you have the following ready:
A Windows PC: The update process typically requires Windows 10 or later.
USB Data Cable: Use a high-quality USB Type-C data cable. Note that standard USB-C to USB-C cables often fail for firmware transfers; a USB-A to USB-C cable is highly recommended.
Latest Firmware Files: Download the official firmware packages directly from the FNIRSI Software Download Page. How to Update DSO-TC2 Firmware
The DSO-TC2 features two distinct firmware components: one for the Oscilloscope functions (prefixed with "CHD") and one for the Transistor Tester functions (prefixed with "CHT"). Enter Upgrade Mode:
With the device powered OFF, connect it to your PC via the USB cable.
Wait approximately 2 seconds after the device boots into its specialized update state. Locate the Device Drive: dsotc2 firmware upd
Your computer should recognize the DSO-TC2 as a removable drive named "CH BOOT". Transfer Firmware Files: Open the "CH BOOT" drive.
Drag and drop the appropriate firmware file (either .bin or .upd format) into this drive.
Note: You can only update one component at a time. If you need to update both the oscilloscope and tester, you must repeat the full process for each file. Complete the Upgrade:
Once the file transfer finishes, the device screen should display "Update completed".
Restart the device to apply the changes. You can verify the new version by checking the "About" section in the settings menu. Troubleshooting Common Issues
Drive Not Appearing: If the "CH BOOT" drive does not show up, try using a different USB-A to USB-C cable or a different USB port on your computer.
Format Prompt: If Windows prompts you to format the drive upon connection, performing a "Quick Format" often resolves recognition issues, though it should be done with caution.
Transfer Prohibitions: Do not attempt to drag any files other than official release firmware into the "CH BOOT" drive, as this can cause irreversible damage to the hardware. FNIRSi DSO TC4 Firmware upgrade
If you want, tell me which specific DSOTC2 device model or show the firmware filename and I’ll provide tailored, step-by-step commands or the exact web UI menu path. If you experience critical issues, you may roll back to v2
(Additional related search terms available.)
FNIRSI DSO-TC2 is a handheld 2-in-1 device that combines a digital oscilloscope with a transistor tester. While it has been largely superseded by the
, firmware updates remain a critical topic for users looking to squeeze more performance or stability out of the original hardware. Firmware Update Overview
Updating the DSO-TC2 is generally a straightforward process that uses the device's USB-C interface
. Most FNIRSI devices follow a "USB Drive Mode" update method: Connection
: Connect the device to a PC while it is powered off using a data-capable USB cable. Mode Entry
: Usually involves holding a specific button (often the power or menu button) while connecting or powering on to enter Update Mode File Transfer
: The device appears as a removable drive on the computer. You simply drag and drop the firmware file (often with a extension) onto the drive. Automatic Install
: Once the file is copied, the device typically processes the update and restarts automatically. Key Improvements & Issues © 2026 DSOTC2 Dev Team
Firmware updates for this series (extending into the newer TC3 and TC4 models) typically focus on the following: Correction of Measurement Logic
: Fixes for issues where the device required a restart between single measurements. Diode Detection
: Resolving bugs where the polarity of diodes was incorrectly identified or displayed. UI/UX Refinements
: Better spacing for transistor diagrams and more accurate display of peak-to-peak ( ) values in oscilloscope mode. Critical Review Considerations Performance Limits
: Even with the latest firmware, the TC2 is often viewed as a hobbyist "toy" rather than a professional lab tool. Its 200kHz bandwidth is very limiting compared to slightly more expensive standalone pocket scopes. The "ESR" Factor
: One of the biggest complaints regarding the DSO-TC2 was its inability to measure ESR (Equivalent Series Resistance) for capacitors. This feature was a major addition for the
, and firmware cannot typically add this functionality to the TC2 due to hardware limitations. Stability Risks
: Some users have reported "bricking" or freezing issues after attempting firmware flashes, where the device only displays a few characters upon restart. Always ensure you have the exact firmware version intended for your hardware revision. For official files and manuals, users should visit the FNIRSI Download Center for a specific OS, or would you like a comparison between the TC2 and TC3 features?