If Error 20 persists, your diagnostic tool itself is bricked via firmware mismatch.
A common bug in SDS 2.0 is the “Calibration Failed” message when resetting a M-Tronic system. stihl diagnostic software 20 fixed
STIHL Incorporated has progressively integrated Engine Control Units (ECUs) into their professional product lines, including the i-Cat series, TS 500i, and advanced battery platforms (AP System). The STIHL Diagnostic Software (version 2.0) serves as the interface between the technician and the machine’s digital infrastructure. Unlike basic code readers, the STIHL proprietary software facilitates bi-directional communication, allowing for parameter adjustments, firmware updates, and real-time sensor data analysis. If Error 20 persists, your diagnostic tool itself
Do not simply reinstall the software. You must clean the drivers first. If Error 20 persists