: The update process typically requires Windows 10 or later.

: 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

With the device powered , connect it to your PC via the USB cable.

: Download the official firmware packages directly from the FNIRSI Software Download Page . How to Update DSO-TC2 Firmware

Wait approximately 2 seconds after the device boots into its specialized update state. :

: 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.

Your computer should recognize the DSO-TC2 as a removable drive named . Transfer Firmware Files : Open the "CH BOOT" drive.

: 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.

The DSO-TC2 features two distinct firmware components: one for the functions (prefixed with "CHD") and one for the Transistor Tester functions (prefixed with "CHT"). Enter Upgrade Mode :

: 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 :