Press and hold the button and the OK/Test button simultaneously.
If you are looking for information on the newer version, the FNIRSI DSO-TC4, check out the official TC4 user manual . fnirsi dso-tc2 firmware
: Connect the powered-off device to your computer. Press and hold the button and the OK/Test
Connect your high-quality USB data cable from the computer to the device's Type-C port. the FNIRSI DSO-TC4








































































