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features a small, restricted onboard memory allocation (U-Disk space). The larger firmware binary files compiled for the newer TC3 or TC4 models onto the TC2 hardware flash storage.
The DSO-TC2 is built around an (Arm Cortex-M3, 256 KB flash, 48 KB RAM) – Correction: Later teardowns show STM32F407VET6 (Cortex-M4 with FPU). We assume the M4 variant for DSP used in oscilloscope triggering. An external 25Q16 (2 MB SPI flash) stores the UI graphics, fonts, and calibration data.
Every time you flash the firmware on a transistor tester or oscilloscope, the internal lookup tables are wiped clean. You must recalibrate the hardware immediately to get accurate readings. To Calibrate the Transistor Tester: fnirsi dso-tc2 firmware
You need an (about $10 on Amazon) and a soldering iron (or fine probes).
Firmware updates for the DSO-TC2 primarily focus on refining the user interface and fixing measurement bugs that users have reported in community forums like EEVblog . Key improvements often found in newer versions include:
: This happens if the wrong firmware version (such as firmware meant for the newer TC3 model) was flashed. Force the device back into bootloader mode by holding the power combo, or disconnect the internal battery for 10 seconds, then attempt to re-flash the correct, verified DSO-TC2 file. This public link is valid for 7 days
But beneath the plastic casing and the glowing screen lies a firmware story that reads like a drama series, filled with villainous bricking attempts, community revolt, and the triumph of open-source reverse engineering.
As of mid-2024, common versions include V1.0.2 , V1.1.8 , V2.0.0 , and V2.1.4 . If your version is older than the latest available, it is time to update.
The stock firmware manages an intricate matrix of internal switching matrix lines to drive separate testing modes. The performance boundaries enforced by the factory firmware include: Metric / Function Stock Firmware Limit 0 to 200 kHz Real-time Sampling Rate Vertical Sensitivity 10mV/Div to 10V/Div PWM Signal Output 0 to 80 kHz (5.0V amplitude) Component Support Can’t copy the link right now
Once the update finishes, the device will reboot automatically. You must recalibrate it immediately. Disconnect the USB cable. Turn on the device and navigate to the menu. Select Calibration .
Installing these was a high-stakes gamble. It required opening the case, finding the hidden programming pads (often unpopulated holes on the PCB), and using an ST-Link programmer to overwrite the chip. It was "interesting" because it turned a consumer device into a DIY kit after you bought it.