Many users encounter a "ghost drive" issue where the device appears as a USB drive but won't allow files to be copied or shows no space. A helpful trick discovered by the community is to perform a "Fast Format"
Usually provided as a .bin or .zip file from the official FNIRSI website or their official AliExpress store repository. How to Update FNIRSI DSO-TC2 Firmware (Step-by-Step) fnirsi dsotc2 firmware
Unlike Arduinos or Raspberry Pi Picos, the DSOTC2 is a closed-source device. FNIRSI does not release its source code to the public. However, the company regularly releases binary firmware files (usually .upd or .bin format) to address bugs and add features. Many users encounter a "ghost drive" issue where
The Fnirsi DSOTC2 is a line of low-cost handheld digital storage oscilloscope (DSO) and multimeter devices produced under the Fnirsi brand (often sold under various reseller listings). “Firmware” in this context means the device’s internal software that implements the user interface, signal acquisition, triggering, display, measurement functions, and communication (USB/serial) features. Discussions titled “Fnirsi DSOTC2 firmware” typically cover the stock firmware behavior, unofficial community firmware builds (bug fixes, new features), flashing/upgrading firmware, and troubleshooting. FNIRSI does not release its source code to the public
: Provides a 200kHz bandwidth and 2.5MS/s sampling rate, with recent firmware versions improving the speed of the function for quicker waveform display. Custom Firmware (Third-Party) : Projects like